Select Sauté and wait for HOT to appear on the display screen.
Add bacon and onions and cook until bacon begins to render, scraping brown bits from bottom of cooking pot. Add 1/4 cup of stock and continue cooking until water has evaporated and onions are tender.
In a small bowl mix together the maple syrup, Worcestershire sauce, brown sugar, mustard, and black pepper.
Add the stock, beans, molasses, ketchup, and maple syrup mixture to the pot and stir.
Lock the lid and place the pressure valve in the Sealing position. Cook at high pressure for 30 minutes. When beep sounds, wait 10 minutes and then carefully release the rest of the pressure.
Add the salt.
Select the Sauté or Browning function and simmer until desired consistency. Beans will continue to absorb liquid as they cool.