Braised Pork Shoulder with bay

4 -6 lbs boneless pork shoulder 2 -3 tablespoons olive oil 1 onion , cut in half, then thinly sliced 4 medium tomatoes , seeded and chopped 4 -6 garlic cloves[...]

2 tablespoons unsalted butter 1 tablespoon vegetable oil 5 lbs pork shoulder, trimmed and cut into 5 equal pieces salt & freshly ground black pepper 5 garlic[...]