Peel and finely dice onions and garlic. Sauté in hot oil for about 5 minutes, add the parsley, season with salt and pepper. Preheat the oven to 225 ° C. Grease the baking dish with butter. Salt and pepper the chops, brush with mustard and place in the tin. Spread the onion mixture over the meat. Pour in the broth and cook everything for about 40 minutes. Garnish with fresh parsley if desired.