1. Preheat grill to medium high heat.
2. Clean and de-beard mussels and clean clams.
3. Place foil roasting pan on grill and add butter, garlic, shallots, dry white wine, and crushed red peppers and stir.
4. Now add mussels and clams in an even layer.
5. Cook until mussels and clams open, about 8-10 minutes.