Mussel and Fingerling Potato Salad

Name: Mussel and Fingerling Potato Salad
Ingredients: 3 pounds small fingerling potatoes; Salt; 1/4 cup extra-virgin olive oil; 8 garlic cloves, thinly sliced; 8 thyme sprigs; 1 large onion, thinly sliced; 1 cup dry rosé wine; 5 tablespoons fresh lemon juice; 6 pounds mussels, scrubbed and debearded; 3/4 cup mayonnaise; 1 tablespoon Dijon mustard; 2 tablespoons chopped capers; 2 tablespoons chopped cornichons; 2 tablespoons chopped parsley; 2 tablespoons chopped chives; Freshly ground pepper