In a cocktail shaker, mix the tequila, lime juice and blackberry syrup. Drop in the basil leaves and add some ice. Shake vigorously and strain into an ice-filled glass. Garnish with additional basil and blackberries.
To make the blackberry syrup
Warm 1 cup water and 1 cup granulated sugar in a small saucepan.
Once the sugar is melted, add a half pint of rinsed blackberries.
Simmer on low for 10-15 minutes and remove from the heat.
Lightly mash the blackberries in the pan.
Strain and pour into a clean jar.
Keeps for about two weeks.
Makes approximately two cups, depending on how “juicy” your berries are.
The syrup can be mixed into lemonade or ginger ale for a non-alcoholic drink.