This has been a staple in my house for many years. My friend's aunt use to make this and it is so much better than the sweet and sour sauces of today. One thing that I like is to omit the catsup and add 2 tablespoons diced cucumber AFTER the mixture has cooled.
- Add sugar, the juice of 2 lemons, and the zest of one lemon and catsup.
- Mix cornstarch with the water and slowly drizzle into mixture.
- Simmer over medium, stirring constantly heat until sauce thickens. It should only take 2-3 minutes for the sauce to thicken.