When the bacon is crisp remove with a slotted spoon and place in the crock pot. Add to the pot with the bacon fat, the onions, carrots and celery (the mire-poix) and cook gently until onions and celery are softened. Place in crock pot with the bacon.
Place the remaining bacon into the dutch oven and cook until crisp. Remove the crisp bacon with a slotted spoon and place in crock pot.
Scrape up any browned bits on the bottom of the pan. Add to the crock pot. Place a lid on the crock pot and walk away. Cook on low for 6 hours. You can do all this the night before. Just cook it the next day, on low, all day long.