Cut watermelon into small pieces and keep them all around the same size. Be sure to remove any seeds.
Make the marinade by mixing all the ingredients together.
In a large bowl, toss the cut watermelon in a little less than half of the marinade and allow to marinate while you prep the pan.
Place the oil in the pan and place the stove to medium high heat.
Once the pan is heated, throw marinated watermelon on the stove and cook until texture softens and color darkens. This will take 20 minutes or longer depending on the type of pan and stove you use. Stir occasionally so watermelon does not burn.
Remove from the stove and place cooked watermelon in a container along with the remaining marinade.
Place in the fridge and allow to marinate for at least 8 hours before serving.