1. Clean the shellfish. Rinse and brush them. Set aside.2. In a pot of boiling salted water, cook the pasta for 8 minutes.3. Meanwhile, put the shellfish and white wine in a pot. Bring to a boil, cover, and cook for 5 minutes. Discard the clams that do not open.4. In a skillet, melt the butter, then sauté the garlic, onion, and parsley.5. Add the filtered clam juice and let it reduce by half.6. Add the lemon juice, salt, and pepper.7. Add the shellfish and bell pepper. Mix with the drained pasta and serve.