Difficulty: Easy - for beginners
1/3 cup white or rice vinegar (Note: rice vinegar gives better results)
4 tablespoons brown sugar
1 tablespoon ketchup
1 teaspoon soy sauce
2 teaspoons cornstarch mixed with 4 teaspoons water
Mix the vinegar, brown sugar, ketchup, and soy sauce together and bring to a boil in a small pot. Mix together the cornstarch and water, add to the other ingredients and stir to thicken.