Combine in a non-reactive saucepan with a glass lid : 2 cups Heinz or Hunts Ketchup, 1/4-1/2 cup yellow mustard, 1/4 cup apple cider vinegar, 1/2 cup firmly packed brown sugar, 3 tablespoons Worcestershire sauce, 2 tablespoon chili powder, 1 tablespoon black pepper, 1 tablespoon onion powder, 1 tablespoon garlic powder, 2 teaspoon celery salt, 2 teaspoons liquid smoke, 1/4 to 1/2 teaspoon of cayenne pepper
Place over medium-high heat, stirring aggressively until starting to boil being careful to avoid splatter. This stuff is thick and will burn you.
Reduce heat to low and cover with glass lid so you can see the action
Occasionally remove from heat and stir well. Please be sure to remove from heat before stirring to prevent splattering and burns.
Simmer for about 30 minutes.
Spoon some into small freezer bags and it should be good for at least several months frozen.