In a blender, combine the strawberries, lemon quarters, sweetener, and 2 cups of water. Blend until smooth.
Strain the mixture into a large pitcher to remove pulp and seeds.
Add the remaining 4 cups of water through the strainer to help extract more flavor.
Taste and adjust sweetness if needed.
Serve cold over ice, garnished with sliced strawberries, lemon slices, and fresh herbs if desired.
