Prep: If using dry navy beans, pre-soak in cold water overnight. Wash the garlic head and clip the top to remove any sand.
Sauté Base: In a saucepan, fry the minced onion until translucent. Stir in the garlic, salt, cumin, nutmeg, paprika, and pepper. Add 3 cups of water and bring to a simmer.
Layer: Add the beans, meat, and marrow bones to the saucepan. Simmer covered for 30–45 minutes until the beans begin to soften.
Slow Cook: Transfer all contents into a slow cooker. Add the whole eggs (in shells) and the quartered potatoes. Add remaining water until the potatoes are just submerged.
Simmer: Cover and cook on low heat overnight (or at least 12–24 hours).
Serve: Carefully remove the eggs, peel them, and arrange on a platter with the potatoes, meat, and bones. Serve the cooking juices and beans in a separate bowl.