Pat the tripe strips dry with paper towels. If yours isn't pre-parboiled, blanch it in boiling salted water for 10 minutes, then drain and rinse well before continuing.
Heat the butter and olive oil in a 6-quart / 5.7 L Dutch oven over medium heat. Add the onion, carrot and celery and cook for 6 to 8 minutes, stirring often, until softened and pale gold.
Stir in the garlic and pancetta and cook for 2 to 3 minutes, until the pancetta releases its fat and turns lightly golden.
Add the tripe strips and cook for 4 to 5 minutes, stirring, to coat them in the fat and let the edges color slightly.
Pour in the red wine and let it bubble for 2 minutes, until mostly evaporated and the raw alcohol smell is gone.
Add the tomato passata, broth, bay leaves and cloves. Season with salt and pepper, bring to a gentle simmer, then cover and cook on low heat for 90 minutes, stirring occasionally, until the tripe is tender enough to cut with a spoon.
Add the diced potatoes and cook uncovered for 20 minutes, until fork-tender but still holding their shape.
Stir in the borlotti beans and a pinch of nutmeg. Simmer for 10 to 15 minutes more to warm the beans through and thicken the sauce slightly.
Taste and adjust salt and pepper. Remove the bay leaves and cloves before serving.
Ladle into bowls, grate the Casera cheese generously over each portion, and serve hot with crusty bread on the side.