2 oz reposado tequila
3/4 oz blueberry-basil syrup
1/2 oz lime juice
Shake all ingredients over ice and double strain into a cocktail glass. Garnish with a basil leaf.
For the blueberry-basil syrup:
Puree 1 cup of blueberries in a food processor. Add to 1 cup water and 1/2 cup sugar in a saucepan and bring to a simmer for about 10 minutes. Take off the heat and add around 10 basil leaves to steep for 10 minutes or so. Strain mixture through cheesecloth into a clean container.