Illustration by Christopher Silas Neal
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In a blender, puree 3 cups watermelon cubes, 2 cups fresh or frozen raspberries, ¼ cup sugar, and 2 Tbsp. lime juice. With a flexible spatula, push the mixture through a fine strainer into a bowl; discard solids.
To finish, pour the mixture into molds and insert sticks. If using cups, freeze until partially frozen and slushy, about 30 minutes, then insert sticks. Freeze until firm, at least 6 hours.