1 lb dried pinto beans soaked overnight 

Cook beans, I cover them with about 1 inch of water and add some salt. I use a pressure cooker, six minutes at full pressure followed by a quick release seems to do well with pintos. Otherwise boil them for at least 20 minutes.

Chop up 4-6 slices of bacon and fry until just crispy.

Add 1/4 to 1/2 cup onions and fry for a minute. Then add cooked beans and enough cooking juice (or water) to cover them.

Add 1 T yellow mustard (or 2 teaspoons dried mustard). 

Mix together 2 T blackstrap molasses and 3/8 cup pure maple syrup. Pour into bean mixture and stir everything up. Salt to taste.

Back at 350 for 2-4 hours. I'm lazy so I do about 2, but it's better the longer you let it go. Check every hour to make sure it's not drying out. Add more water if needed.