Directions

1.  Purée dragon fruits, pineapple, lemon juice and agave syrup in a blender, in batches if necessary, on high until smooth; strain through fine-mesh strainer into a large pitcher, pressing down on solids with the back of a spoon. Discard solids; cover and refrigerate dragon fruit mixture at least 2 hours or up to 3 days.

2.  Stir club soda and ice, if desired, into dragon fruit mixture just before serving. Makes about 8 cups.