Mussels Ravigote!

Name: Mussels Ravigote!
Ingredients: 1/4 cup finely chopped red onion; 1/4 cup chopped fresh parsley; 1 tablespoon minced fresh tarragon; 1/4 cup sliced cornichons; 1 tablespoon white wine vinegar; 2 teaspoons capers; 1 1/2 teaspoons extravirgin olive oil; 1 teaspoon Dijon mustard; 1 garlic clove, minced; 1 cup dry white wine; 1 (8-ounce) bottle clam juice; 48 mussels (about 2 pounds), scrubbed and debearded; 2 baking potatoes, cut into 1/4 inch strips with skin left on; Olive oil; 1/4 cup freshly grated parmesan cheese