In a medium-size mixing bowl (or a 2 c. measuring cup), whisk together the ketchup, brown sugar, Sriracha, Worcestershire, rice vinegar, chicken stock, black pepper, and red pepper flakes. Set aside.
To Use Over Meat/Vegetables
Whisk the cornstarch into the sauce and pour over the meat, add the chopped vegetables, and stir to coat.
Place in the oven and bake uncovered for 50 minutes, stirring every 15 minutes or so. Remove and serve immediately.
To Use as a Dip
To use as a dip, boil the ingredients except for the cornstarch. Once boiling, make a cornstarch slurry (cornstarch mixed with 1 tsp water) and add it. Then stir to thicken.
To Use as a Marinade
Simply omit the cornstarch. Place the remaining sauce ingredients in a container and mix together, then add the meat and let it marinate in the fridge.
Notes
STORE Sweet and Sour Sauce in an airtight container in the refrigerator for up to 2-3 weeks. You can also FREEZE the sauce for up to 3 months.To REHEAT, thaw the frozen sauce in the refrigerator overnight if needed, then warm it on the stovetop over medium heat or in the microwave in 30-second intervals, stirring occasionally until heated through.If, after storing, this sauce isn't quite as tangy as normal, simply add more vinegar. Start by adding only ¼ tsp and adjust from there. If you accidentally add too much, counter the tangy flavor by adding sugar.