Drain baby and minced clams, reserving juice; set clams and juice aside. In a large skillet, saute onion in oil and butter until tender. Add parsley and garlic; saute for 2 minutes. , Add drained clams; saute 2 minutes longer. , Combine cornstarch and clam juice until smooth; stir into skillet with wine or broth. Bring to a boil; cook and stir 1-2 minutes or until thickened. Stir in the basil, pepper and cayenne. Serve sauce over linguine; sprinkle with Parmesan cheese.