Preheat oven to 375 degrees F. Preheat a grill pan over high heat.
Season chicken with grill seasoning or salt and pepper. Combine lemon, sherry and oil in a shallow dish and turn chicken in the mixture to coat evenly. Score chicken 2 minutes on each side on grill. Transfer to a baking dish and set chicken into oven. Roast chicken for 15 minutes. Add linguica to hot grill pan and reduce heat to medium high. Grill 10 minutes to crisp casings and remove from heat. Pile chicken on serving plate and top with parsley. Pile linguica along side chicken and serve.