Heat the olive oil in a large skillet over medium-high heat. Add the chorizo and cook until browned, about 2 mintues. Add the pork and cook until browned, 3 to 4 minutes. Stir in teh onion, garlic, paprika, coriander, and allspice. Season with salt and pepper. Cook for 5 minutes. Add in the brown sugar, Worcestershire sauce, lime peel and juice and stir well. Add in the broth and tomato sauce and simmer for a few minutes, until thickened.

Lightly toast the buns under the broiler. Divide the meat mixture between the rolls and place a slice of cheese on each. Broil until the cheese melts, about 30 seconds. Top each with pickles and the bun top and serve.