Best Barbecue Sauce

I originally got this barbecue sauce from a "Fine Cooking" magazine, which is a great magazine to subscribe to for some excellent meals. I added a few of my touches and everyone absolutely loved it at our next barbecue. Great for chicken and ribs.

3/4 cup firmly packed dark brown sugar
1/4 cup honey
1 Tbs. onion salt
1-1/2 tsp. celery seeds
1-1/2 tsp. Tastefully Simple Garlic Garlic Seasoning
1-1/2 tsp. chili powder
1 tsp. finely ground black pepper
1 tsp. ground cumin
2 cups tomato ketchup
1/4 cup white vinegar; more to taste
2 Tbs. hot and spicy mustard
1 tsp. fresh lemon juice
1 tsp. liquid smoke (I use Mesquite flavor)
4 Tbs. butter, cubed and chilled


Combine all ingredients except for butter in a medium saucepan. Bring to a slow boil, stirring to dissolve the sugar.  Reduce heat and simmer for 25 minutes while stirring occasionally. Whisk in butter cubes a couple at a time. Use over favorite meat.