Lobster Mac and Cheese

Name: Lobster Mac and Cheese
Ingredients: 4 (6 oz. each) lobster tails; 1 pound cavatappi or elbow pasta; 4 tablespoons unsalted butter; 1 tablespoon olive oil; 1 medium yellow onion, finely chopped; 1 medium shallot, finely chopped; 3 cloves garlic, finely chopped; 1/3 cup all purpose flour; 2 1/2 cups whole milk; 1/4 cup dry sherry; juice of 1 lemon; 1 teaspoon stone ground dijon mustard; 1 tsp. sea salt; 1/4 teaspoon cayenne; 1/4 teaspoon pepper; 2 1/2 cups freshly grated white cheddar cheese; 2 cups freshly grated gruyere cheese; 1 1/4 cups freshly grated dubliner cheese; 2 tablespoons mascarpone cheese; 3/4 cup panko breadcrumbs; chopped fresh chives for garnish