Summertime BBQ Sauce

1/2 cup Karo Light Syrup
1/2 cup Ketchup
1/2 cup finely diced or grated onion
1/4 cup Apple Cider Vinegar
1/4 cup Worcestershire Sauce
1/4 cup prepared Yellow Mustard

Mix all ingredients in a small saucepan. Bring to a boil and simmer for 15-20 minutes until desired thickness. Use over meat or vegetables.