primal egg coffee in a glass

Signature Lactic Acid Brew

The Signature Lactic Acid Brew is both simple and complex, delicious and coffee-centric. No covering up the flavor of the espresso with tons of milk and sugar – only ingredients that gently complement the aroma, texture, and taste are added, thereby creating an overall masterful experience. This tutorial focuses on the drink created by Andrea Allen of Onyx Coffee Lab.

Course Drinks
Cuisine American
Keyword Signature Lactic Acid Brew recipe
Prep Time 3 minutes
Cook Time 2 minutes
Total Time 5 minutes
Servings 1
Calories 42 kcal


  • 84 grams lactic washed green tip Geisha espresso
  • 25 grams clarified milk
  • 6 dashes rose water
  • 2 dashes acid phosphate
  • 6 grams terroir coffee blossom honey simple syrup
US Customary - Metric


  1. Brew the coffee

  2. Pour 25 grams of clarified milk into your espresso

  3. Add six dashes of rose water

  4. Add two dashes of acid phosphate

  5. Pour in your 50/50 mixture of “simple syrup” using half water and half Terroir coffee blossom honey

  6. Give the mixture a gentle stir or two