4 cups super-ripe blackberries
2 cups cold water
4 teaspoons lime juice
2 tablespoons lemon basil-infused agave nectar
For the infused agave nectar: Simmer agave nectar over low heat. Remove from heat, add 1 tablespoon chopped lemon basil. Let steep for 15 minutes until flavor has infused the nectar.
Blend all ingredients, adjusting sweetness as needed. Strain through a mesh strainer or cheesecloth (optional). Serve over ice.