Stir ketchup and brown sugar together. Add in the rest of the ingredients except the cornstarch. Once the mixture gets warm, stir in the cornstarch mixed in with 2 tablespoons water. Bring to boil and serve. Can also add a bit of sesame oil, pineapple juice or bits, etc. You can also adjust the cornstarch depending on how thick you like it. I usually triple this recipe for our family. Goes with meatballs, hamburger, chicken, pork, chicken nuggets, ribs, pot stickers… Yummy is adding in 1/4 tsp toasted sesame oil.