Grandma & Grandpa's Barbeque Sauce

1 bottle Hunts ketchup (36 oz)
1 cup orange juice
1/4 cup worchestershire sauce
1/4 stick butter
1 chopped onion

Pour the ketchup into a saucepan.  Pour orange juice into the ketchup bottle, shake, and pour into the saucepan.  Add worchestershire sauce, butter, and onion.  Bring to a boil, reduce heat.