Cut the watermelon into several thick slices, making sure to leave the rind on. Quarter the watermelon slices. Cut sections out of the middle of the quartered watermelon slices and refrigerate the slices while you prepare the soft serve ice cream.
Place the cut-out melon pieces into a blender and add more watermelon until you have a bit more than 20 oz. Add the Greek yogurt, honey, and lime juice to the blender and purée everything until it is smooth and even.
Pour the contents of the blender through a sieve and place in the freezer. Remove the bowl every hour and stir until creamy. Repeat this 3 more times. Then let the cream chill in the freezer for at least 12 hours.
After 12 hours, scoop the watermelon soft serve ice cream into a piping bag and fill the cut-out sections from the watermelon slices with the pink sweet treat. Garnish the watermelon soft serve slices with chocolate chip 'seeds.'
