3/4 cup sugar
1/2 cup water
1/4 cup lemon juice
3 cups watermelon
¾ cup mini chocolate chips
In a small saucepan, over medium-high heat, cook the sugar, water and lemon juice together, stirring occasionally until the sugar is dissolved.Remove from heat and chill.
Cut up the watermelon and remove all seeds. Puree with a hand blender or a food processor. Add the chilled syrup and blend.
Freeze in an ice-cream maker according to the manufacturer's instructions. At end of cycle add in mini chocolate chips, if using.
Pack into an airtight container and store in the freezer.