For the best flavor, use an artisanal root beer made with cane sugar (not corn syrup). We like Faygo and Fitz's, but many more options are available online at sodapopstop.com.
Ingredients
4 slices applewood-smoked bacon, cut crosswise into 1-inch pieces
Preheat oven to 400°F. Cook bacon in large ovenproof pot over medium heat until crisp, stirring occasionally. Using slotted spoon, transfer bacon to paper towels. Add onions to drippings in pot; cook until beginning to brown, stirring often, about 8 minutes. Add garlic; stir 1 minute. Add beans, root beer, vinegar, molasses, tomato paste, mustard, chili powder, 1 teaspoon salt, and 1 teaspoon pepper; mix. Stir in bacon; bring to boil. Transfer to oven; bake uncovered until liquid thickens, about 30 minutes.