Sweet Potato Sweetened Baked Beans

Name: Sweet Potato Sweetened Baked Beans
Ingredients: 1 pound dried navy beans, soaked overnight (or 4 cans of small white beans, drained with bean liquid reserved); 3 sweet potatoes; 1/2 cup 100% maple syrup; 6 slices of thick-cut bacon, cut in 1/4 inch strips; 1 large white onion, finely diced; 1 bell pepper, finely diced; 5 garlic cloves, minced; 2 teaspoons dried mustard; 1/4 teaspoon cayenne; 4 tablespoons tomato paste; 2 tablespoons brown sugar, packed; 1 can of beer; 2 cups chicken stock