Method
Preheat the oven to 160°C (325°F) with a rack in the lower third.
Dice the peameal bacon and onion. Drain and rinse the beans.
Heat a Dutch oven over medium heat, add the peameal bacon and onion and cook, stirring, until the onion softens and the bacon browns, about 6 minutes.
Stir in the beans, maple syrup, tomato paste, mustard, vinegar, water and pepper until the tomato paste dissolves.
Cover and bake for 1 1/2 hours, stirring once halfway.
Uncover and bake 30 minutes more, until the sauce is thick and glossy and the bacon is well past 71°C (160°F). Add a splash of water if it dries out.
Rest 10 minutes before serving. Keeps 5 days in the fridge and freezes well.
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Swaps
- Vegan: leave out the bacon and add smoked paprika.
Storing and reheating
Keeps 5 days or 3 months frozen.