01 - For dried beans, soak overnight in cold water, then drain and rinse. Place beans in a large pot, cover with fresh water, and simmer for 1 hour or until just tender. Drain beans before proceeding.
02 - Preheat oven to 325°F (165°C).
03 - In a large oven-safe pot or Dutch oven, heat melted butter over medium heat. Add onion and garlic and sauté until softened and fragrant, about 5 minutes.
04 - Stir in tomato paste, maple syrup, apple cider vinegar, Dijon mustard, smoked paprika, salt, and black pepper. Mix thoroughly.
05 - Add cooked or canned beans and water (or vegetable broth) to the pot. Stir gently to combine all ingredients.
06 - Bring mixture to a simmer, then cover with an oven-safe lid and transfer the pot to the oven.
07 - Bake for 2 hours, stirring once halfway through. If beans begin to dry out, add more water as needed.
08 - Remove lid for the last 30 minutes of baking to allow the top to brown and sauce to thicken.
09 - Taste and adjust seasonings as needed. Garnish with fresh parsley before serving, if desired.