You'll need:
1/8 cup fresh or frozen peas (defrosted)
Pinch sugar
3/4 oz mint simple syrup (see below)
3 oz vodka
1/2 oz dry vermouth
Muddle the peas with the sugar in the bottom of a cocktail shaker. Add ice and the rest of the ingredients; shake to combine. Serve up in a chilled cocktail glass. Enjoy!
For the mint simple syrup:
Mix equal parts hot (not boiling) water and sugar in a bowl. Stir to dissolve the sugar, and add a handful of mint. Let steep for a few minutes, and store in an airtight container in the refrigerator for up to a week.