How to make Hatch chili BBQ sauce

User 'tdjtx' shows us how to make a delicious homemade Hatch chili BBQ sauce. Try it out yourself and let us know how it tastes! Ingredients: 1 diced onion, 2 tbsp butter, 1 c chopped tomatoes, 1/2 c diced roasted Hatch chili's, 1/2 c minced celery, 1 c catchup, 2 tbls brown sugar, 1/2 tsp mustard powder, 2 c chicken stock, 1 tsp salt, 1/4 tsp cayenne pepper, black pepper to taste.