Add all ingredients to a shaker and fill with ice.
Shake, and strain into a coupe glass.
*Oleo saccharum sour mixINGREDIENTS:
Peel from one lemon
Peel from one grapefruit
4 oz sugar
.5 cups lemon juice
PREPARATION: Using a vegetable peeler or similar tool, peel the entire surfaces of the grapefruit and lemon into a bowl. Add the sugar and muddle, ensuring that the sugar is worked into the peels well. Let stand for 4 to 6 hours. Push the peels away to the sides of the bowl, allowing the oils to gather in the center. Remove the peels and transfer the oleo saccharum into a jar. Add the lemon juice, seal and shake until fully combined. Chill before using.