7 ½ cups seedless watermelon, chopped into chunks, divided
•
1 ½ cups white sugar
•
3 limes, juiced, or more to taste
•
4 tablespoons chamoy (Mexican chili fruit condiment), or more to taste (Optional)
•
2 tablespoons chili-lime seasoning (such as Tajin®) (Optional)
Instructions
Place 2 1/2 cups watermelon into an electric blender and liquefy. Transfer juice to a saucepan and add sugar and lime juice. Bring to a boil; reduce heat and let simmer until all sugar has dissolved, about 5 minutes. Set aside and allow to cool, about 20 minutes. Chill and store simple syrup in a closed glass jar in the refrigerator.
Place remaining watermelon chunks on a cookie sheet lined with parchment paper and freeze until solid, about 4 hours.
Add frozen watermelon pieces, a few at a time, to the bowl of a food processor and puree. Add 1/3 to 1/2 cup of the simple syrup mixture, followed by chamoy and chile-lime seasoning; process until smooth. Serve right away or store in an airtight plastic container in the freezer.