Step 1

For the froth: Add the lemons, sugar and 3/4 cup water to a blender. Blend until smooth, then strain the mixture through a fine mesh strainer.

Step 2

For the drink: Add ice to an all-purpose wine glass. Pour in the amaro and 1 1/2 ounces lemon froth and stir to combine (save the remaining lemon froth for another use). Top with the Champagne and garnish with the lemon twist.