FOR THE COCKTAIL

1. MUDDLE BERRIES: Add 2-3 blackberries to a cocktail shaker and muddle them.
2. ADD INGREDIENTS: Next, add the plum bitters and then the lemon juice, strawberry simple syrup, gin, and aquafaba (or egg white).
3. ADD ICE & SHAKE: Fill the shaker with ice and shake vigorously for 30 seconds or so.
4. SHAKE AGAIN: Stain into a glass and discard the ice. Return the cocktail to the shaker and give it another good shake.
5. STRAIN INTO COCKTAIL GLASS: Stain the cocktail into a cocktail glass (to remove any berry seeds or pulp). You might have to scoop out some of the foam with a spoon.
6. GARNISH AND ENJOY! 

FOR THE STRAWBERRY SYRUP

1. ADD INGREDIENTS TO PAN: Add the strawberries, sugar, water, and lemon juice to a large saucepan and bring to a boil.
2. LET SIT: Once the water is boiling, immediately turn off the heat and cover the pan. Let it sit (without heat) for about an hour. 
3. MASH & STRAIN: Next, mash the strawberries with a potato masher. Then strain the mixture into a large, air-tight container. Let cool completely, cover, and store in the refrigerator until ready to use. It will last a week or two.