ttopshelf
Members
DinnerBeefGrillingBakingmake-aheadsummersteak-side

Make-Ahead Grilled Summer Vegetable Gratin with Parmesan & Lemon — Labour Day Steak Side

Charred summer zucchini, yellow squash, eggplant and sweet peppers are layered with a light lemon-parmesan cream, topped with crisp panko and broiled until golden. Assemble ahead for an effortless Labour Day steak side and finish on the grill or under the oven broiler for a smoky, golden topping.

0.0(0 reviews)
Prep: 45m · Cook: 25m · Total70 mins
DifficultyMedium
Serves6
Jake
AuthorJake
Make-Ahead Grilled Summer Vegetable Gratin with Parmesan & Lemon — Labour Day Steak Side

Ingredient Spotlight

Crème fraîche

A cultured cream from France with a high fat content that is richer and less tangy than sour cream; it’s smooth and mildly tangy with a lightly nutty dairy aroma and holds up when warmed. You’ll find it in the refrigerated dairy section of large supermarkets, specialty grocery stores, or international markets. Good substitutes are full-fat Greek yogurt (thicker and tangier) or a mix of heavy cream and a small amount of cultured buttermilk left to thicken, though flavor and stability will differ slightly.

Ingredient Spotlight

Panko breadcrumbs

Panko are Japanese-style breadcrumbs made from crustless white bread that are dried into large, airy flakes; they produce a very light, extra-crispy crust compared with regular breadcrumbs. Look for them in the Asian foods aisle or breading/cracker section of most supermarkets and Asian markets. If you can’t find panko, use regular breadcrumbs, crushed cornflakes, or pulse crustless bread into coarse crumbs for a similar effect, though texture will not be identical.

🛒 Buy on Amazon

(paid link) — as an Amazon Associate we earn from qualifying purchases.

Jake

Jake's note

"This gratin is designed to be mostly done ahead so you can focus on the steak and guests. The bright lemon-parmesan cream keeps it feeling fresh, while the charred vegetables echo grill-smoke flavors."

Make-Ahead Grilled Summer Vegetable Gratin with Parmesan & Lemon — Labour Day Steak Side

This gratin is built on contrasts: summer vegetables cooked over high heat until their skins blacken and sugars concentrate, then layered with a lemony, slightly salty Parmesan cream and finished with a golden panko crust. The char from the grill gives each slice a smoky backbone that stands up to steak, while the crème fraîche (or full-fat Greek yogurt) lends a cool, tangy counterpoint so the dish never feels heavy. Texturally it’s generous—silky eggplant, tender squash ribbons and crisp-topped crumbs—but the bright lemon keeps every bite lively.

What makes this version work for holiday cookouts is its make-ahead logic. You do the labor (and the smoky char) when you have time, refrigerate the assembled pan, and then finish on the grill or under the broiler for a last-minute showpiece with minimal fuss. It’s tailor-made for hosts who want a vegetable-forward side that looks and tastes deliberate next to a simply grilled steak, and the panko-Parmesan topping gives you that irresistible crunch that crowds will fight over.

Plan your timing

5:43 pm–5:55 pm→Slice and char the vegetables
5:55 pm–6:07 pm→Make the lemon-parmesan cream
6:07 pm–6:19 pm→Prepare the panko topping
6:19 pm–6:31 pm→Assemble the gratin (make-ahead)
6:31 pm–6:43 pm→Finish on the grill or in the oven
6:43 pm–6:55 pm→Serve and dairy-free shortcut
Advertisement

Ingredients

Yield
6

Instructions

Slice and char the vegetables

Slice zucchini and yellow squash lengthwise into 1/4" slices, cut eggplant into 1/2" rounds, and quarter the peppers, removing stems and seeds. Toss all vegetables with 2 tbsp olive oil and a generous pinch of the kosher salt and black pepper. Grill over high heat (or use a ridged grill pan) in batches, 3–5 minutes per side, until deeply charred and tender; set aside to cool slightly. (If using a hot gas grill, you can place peeled pepper halves skin-side down until blistered and charred.)

For this step

  • 3 medium (total)Zucchini and yellow squash (combined)
  • 1 mediumEggplant
  • 2 mediumSweet bell peppers (red/yellow)
  • 3 tbspExtra-virgin olive oil
  • 1 tsp salt + 1/2 tsp pepper (approx)Kosher salt and freshly ground black pepper
Slice and char the vegetables

Make the lemon-parmesan cream

Whisk together the crème fraîche (or Greek yogurt), grated Parmesan (reserve 2 tbsp for topping), lemon zest and 1 tbsp lemon juice with the remaining pinch of salt and pepper until smooth. Taste and adjust acidity or salt — the mixture should be bright but not overpoweringly tart. This light cream binds the layers and keeps the gratin from feeling heavy.

For this step

  • 1 cupCrème fraîche or full-fat Greek yogurt
  • 0.75 cupGrated Parmesan cheese
  • 1 medium (zest + 1 tbsp juice)Lemon (zest + 1 tbsp juice)
Make the lemon-parmesan cream

Prepare the panko topping

Mix the panko breadcrumbs with the melted butter, remaining reserved Parmesan, and 1 tbsp olive oil until moistened and evenly coated. This will give a golden, crisp finish under the broiler or on the grill. Set aside until assembly.

For this step

  • 1 cupPanko breadcrumbs
  • 2 tbspUnsalted butter (melted)
Prepare the panko topping

Assemble the gratin (make-ahead)

Spread a thin layer of lemon-parmesan cream in the bottom of a 9x13" (or equivalent shallow) ovenproof baking dish. Layer half the charred vegetables, dollop and spread half the cream, then repeat with remaining vegetables and cream. Sprinkle the panko mixture evenly over the top. Cover tightly and refrigerate for 1–24 hours — the gratin holds well overnight, making this an ideal make-ahead Labour Day side.
Assemble the gratin (make-ahead)

Finish on the grill or in the oven

From chilled: to reheat on the grill, preheat grill to medium (about 375–400°F / 190–205°C). Place dish on the cooler part of the grate, cover and heat 10–12 minutes until warmed through, then move over direct medium-high heat (or increase grill temp) and cook 3–6 minutes with lid closed until topping is crisp and golden — watch closely to avoid burning. For oven: preheat to 375°F (190°C), cover with foil and bake 20–25 minutes until hot; remove foil and broil 2–4 minutes until topping is golden. Let rest 5 minutes before serving.
Finish on the grill or in the oven

Serve and dairy-free shortcut

Serve hot alongside grilled steak—ladle or slice into 6 portions (about 1 cup each). Shortcut dairy-free variation: swap the crème fraîche and Parmesan for 1 cup unsweetened dairy-free yogurt or mayo plus 3 tbsp nutritional yeast; skip the butter in the panko and toss crumbs with 2 tbsp olive oil instead. Grill finish times are the same for the dairy-free version.
Serve and dairy-free shortcut

Tips from the kitchen

Salt eggplant early

Salt thick eggplant rounds 20–30 minutes before grilling and blot away moisture to reduce bitterness and prevent sogginess during assembly.

Char in manageable batches

Work in batches so the grill stays hot—crowding cools the grates and produces steaming instead of proper charring.

Protect the panko topping

If finishing on the grill, set the dish on the cooler side first to warm through, then move it briefly over direct heat to brown so the crumbs crisp without burning.

Keep cream bright

Taste the lemon-Parmesan mixture before assembly and err on the side of less acid; chilling mutes citrus, so it should be lively but not sharp.

Toast panko first

For extra depth, toast the panko in a skillet with the butter and oil until lightly golden before topping—this prevents raw crumbiness after baking.

Variations & substitutions

Tomato and basil

Layer thin slices of ripe tomato and a handful of chiffonaded basil between the charred vegetables for a Caprese-inspired lift; omit some lemon to avoid competing acidity.

Smoky harissa twist

Stir 1–2 tbsp mild harissa into the cream and add a tablespoon to the panko for a warm, smoky heat that pairs beautifully with grilled steak.

Cheese-forward gratin

Swap half the Parmesan for grated Gruyère or aged fontina for a more indulgent, melty interior while keeping the panko crisp on top.

Vegan/dairy-free option

Use unsweetened dairy-free yogurt or blended silken tofu plus 3 tbsp nutritional yeast for umami, and toss panko with olive oil instead of butter to keep the topping crisp.

Storage & make-ahead

Keep leftovers covered in the refrigerator for up to 3–4 days; the topping will soften a bit but the flavors meld nicely overnight. To reheat, warm in a 350°F (175°C) oven until heated through and then broil or place briefly over direct grill heat to re-crisp the panko—avoid microwaving if you want to preserve texture. You can freeze the gratin (without the panko topping) for up to 2 months; thaw thoroughly, add fresh crumbs and finish under the broiler.

What to serve with it

Serve this gratin alongside a simply seasoned, high-heat grilled steak—flank or ribeye work particularly well—so the gratin’s brightness cuts through the meat’s richness. Offer a crisp, herb-forward salad (think arugula with lemon and shaved fennel) and grilled corn for a full summer spread. For drinks, a chilled Provençal rosé or a medium-bodied Grenache pairs nicely with the smoky vegetables and Parmesan.

Frequently asked questions

My vegetables released a lot of water — how can I prevent a soggy gratin?

Salt eggplant ahead of time and pat dry, don't overcrowd the grill to avoid steaming, and allow grilled vegetables to cool on a rack so excess moisture drains before layering.

Can I roast the vegetables instead of grilling?

Yes — roast at 450°F on a rimmed sheet until deeply browned and tender (about 20–30 minutes), flipping once; you’ll miss some smokiness but the caramelization still gives great flavor.

How far ahead can I assemble the gratin?

You can assemble and refrigerate the covered dish for 24 hours; beyond that the topping may soften further and vegetables will continue to shed moisture.

Is this dish freezer-friendly?

It freezes best without the panko topping; store covered for up to 2 months, thaw overnight, add fresh crumbs, and reheat/broil to crisp.

Why use crème fraîche instead of mayonnaise or heavy cream?

Crème fraîche provides a tangy richness and stabilizes when warmed, so the gratin stays creamy without becoming greasy like mayo or overly heavy like heavy cream.

Jake

About the author

Jake

Hello, I'm Jake. I started this recipe site with the idea that I hated recipe websites that overwhelm you with long stories and ads just to see plain content that's not helpful. My goal is to provide you with quality recipes, simple ideas and a fun cooking experience. There's lots of fun things to cook, and I think as you browse the site you'll find that TopShelf.Recipes is the place for quality recipes on the web.

See all recipes by Jake →

Ratings & Reviews

Did you make this recipe?

Be the first to share your experience.

Ingredients

6 servings
Step 1: Slice and char the vegetables
  • Zucchini and yellow squash (combined)3 medium (total)
  • Eggplant1 medium
  • Sweet bell peppers (red/yellow)2 medium
  • Extra-virgin olive oil3 tbsp
  • Kosher salt and freshly ground black pepper1 tsp salt + 1/2 tsp pepper (approx)
Step 2: Make the lemon-parmesan cream
  • Crème fraîche or full-fat Greek yogurt1 cup
  • Grated Parmesan cheese0.75 cup
  • Lemon (zest + 1 tbsp juice)1 medium (zest + 1 tbsp juice)
Step 3: Prepare the panko topping
  • 🛒 BuyPanko breadcrumbs1 cup
  • Unsalted butter (melted)2 tbsp

🛒 = paid link — as an Amazon Associate we earn from qualifying purchases.

Nutrition Facts

Per serving: about 1 cup (120g)

Calories626
Total Fat40.1g
Saturated Fat16.9g
Trans Fat0.2g
Polyunsaturated Fat13g
Monounsaturated Fat4.2g
Total Carbohydrates50.9g
Dietary Fiber8.8g
Total Sugars12.1g
Protein18.1g

Nutrition values are estimated from USDA ingredient data and may vary based on preparation, brands, and portion sizes. Values are provided for informational purposes only.

More from Dinner

View all Dinner recipes →
Classic Bourbon-Bacon Baked Beans — Slow-Baked Steakhouse Side for Labour Day Cookouts
NewMedium
205 mins

Classic Bourbon-Bacon Baked Beans — Slow-Baked Steakhouse Side for Labour Day Cookouts

Grilled Potato & Corn Skewers with Herb-Butter and Chimichurri — Labour Day Steak Side
NewEasy
50 mins

Grilled Potato & Corn Skewers with Herb-Butter and Chimichurri — Labour Day Steak Side

Classic Slow-Baked BBQ Baked Beans with Bacon & Molasses (Make-Ahead Labour Day Side)
NewMedium
175 mins

Classic Slow-Baked BBQ Baked Beans with Bacon & Molasses (Make-Ahead Labour Day Side)

Sous-chef
Make-Ahead Grilled Summer Vegetable Gratin with Parmesan & Lemon — Labour Day Steak Side

Ask me anything about this recipe — substitutions, scaling, techniques, timing.

Powered by AI · Answers may not always be perfect