This is so easy and so refreshing. You can buy reduced balsamic, or use the following recipe.
3 tablespoons brown sugar (if you make your own balsamic)
What you do:
1. If you are reducing your own balsamic, boil 1/2 cup of balsamic vinegar on low until it is reduced by about half. Add the sugar and stir until dissolved.
2. Toast the pistachios in a dry frying pan on medium low, being careful not to burn them. When cooled, chop pistachios.
3. Cut watermelon into cubes.
4. Drizzle a little of the cooled reduced balsamic on each piece of watermelon, then top with chopped pistachios.