Richard's Bbq Sauce

Ingredients

• 2 quarts Green peppers chopped
• 2 quarts Yellow onions chopped
• 2 cups Bacon drippings or salad oil
• 2 cups Light brown sugar packed
• 2 cups Cidar vinegar
• 3 each Lemons halved
• Wright's Liquid Smoke (do not substitute) to taste
• 1/2 cup Rosemary leaves or more, to taste
• 2 tablespoons Granulated garlic
• 1 teaspoon Crushed red pepper flakes
• 2 teaspoons Black pepper
• 1/4 cup Kosher salt or to taste
• 1 #10 can Ketchup
• Cornstarch as required