Coffee Caviar

How to Make Coffee Caviar

1. 1

   Step 1: Prepare the coffee-calcium mix

   Warm a small portion (about 2–3 tablespoons) of the coffee very briefly or use a spoon to help dissolve the sugar: stir the granulated sugar into the coffee until fully dissolved. While the coffee is still slightly warm or at room temperature, whisk in the calcium lactate gluconate until completely dissolved. Chill the mixture in the fridge until cold — cold coffee gives firmer pearls and prevents alginate bath warming.

   For this step

   • 1 cupStrong cold-brew coffee or well-diluted espresso (cooled)
   • 2 tablespoonsGranulated sugar
   • 1 teaspoonCalcium lactate gluconate (food-grade)
   
2. 2

   Step 2: Make the sodium alginate bath

   Measure the cool water into a tall container and sprinkle the sodium alginate evenly over the surface. Use an immersion blender (or stand blender) on low to blend for about 1–2 minutes until the alginate is fully hydrated and evenly dispersed. Cover and let the bath sit for 20–30 minutes to remove bubbles and allow viscosity to stabilize.

   For this step

   • 4 cupsCool water (for the sodium alginate bath)
   • 1 1/2 teaspoonsSodium alginate (food-grade)
   
3. 3

   Step 3: Check textures and degas

   After resting, skim any surface foam from the alginate bath and pop visible bubbles with a spoon — a smooth bath produces rounder pearls. Give the chilled coffee-calcium mix one last stir (avoid introducing air) and transfer it into a squeeze bottle, pipette, or a plastic syringe fitted with a wide tip for consistent droplets.
   
4. 4

   Step 4: Form the coffee caviar

   Hold the bottle or syringe about 2–3 inches (5–7 cm) above the alginate bath and gently squeeze out droplets — they will form spheres as they hit the bath. Let them sit in the bath for 60–90 seconds for a thin gel membrane (longer for thicker skin), then scoop them with a slotted spoon or mesh skimmer and transfer immediately into the cold rinse water to stop setting and remove excess alginate.

   For this step

   • 1 cupCold water (for rinsing and finishing)
   
5. 5

   Step 5: Serve or store

   Drain the rinsed pearls and keep them in a small bowl of chilled coffee or neutral simple syrup until ready to use. This batch makes enough garnish for about 6 cocktails (roughly 6 tablespoons of pearls); use them within 24 hours for best texture and flavor. Gently spoon pearls over cocktails, affogatos, or plated desserts just before serving.
   

1. Warm a small portion (about 2–3 tablespoons) of the coffee very briefly or use a spoon to help dissolve the sugar: stir the granulated sugar into the coffee until fully dissolved. While the coffee is still slightly warm or at room temperature, whisk in the calcium lactate gluconate until completely dissolved. Chill the mixture in the fridge until cold — cold coffee gives firmer pearls and prevents alginate bath warming.
2. Measure the cool water into a tall container and sprinkle the sodium alginate evenly over the surface. Use an immersion blender (or stand blender) on low to blend for about 1–2 minutes until the alginate is fully hydrated and evenly dispersed. Cover and let the bath sit for 20–30 minutes to remove bubbles and allow viscosity to stabilize.
3. After resting, skim any surface foam from the alginate bath and pop visible bubbles with a spoon — a smooth bath produces rounder pearls. Give the chilled coffee-calcium mix one last stir (avoid introducing air) and transfer it into a squeeze bottle, pipette, or a plastic syringe fitted with a wide tip for consistent droplets.
4. Hold the bottle or syringe about 2–3 inches (5–7 cm) above the alginate bath and gently squeeze out droplets — they will form spheres as they hit the bath. Let them sit in the bath for 60–90 seconds for a thin gel membrane (longer for thicker skin), then scoop them with a slotted spoon or mesh skimmer and transfer immediately into the cold rinse water to stop setting and remove excess alginate.
5. Drain the rinsed pearls and keep them in a small bowl of chilled coffee or neutral simple syrup until ready to use. This batch makes enough garnish for about 6 cocktails (roughly 6 tablespoons of pearls); use them within 24 hours for best texture and flavor. Gently spoon pearls over cocktails, affogatos, or plated desserts just before serving.