Lobster Mac and Cheese

Name: Lobster Mac and Cheese
Ingredients: 6 small fresh lobster tails (1 1/2 pounds total); 8 tablespoons (4 ounces) unsalted butter, divided, plus more for greasing baking dish; 1 small (5 ounces) yellow onion, sliced (3/4 cup); 3 garlic cloves, sliced; 1 (6-inch) thyme sprig, plus thyme leaves for garnish; 1 cup dry white wine; 2 cups whole milk; 1 cup heavy whipping cream; 2 (6-inch) tarragon sprigs, plus tarragon leaves for garnish; 1 pound uncooked short curly pasta (such as cavatappi or campanelle); ⅓ cup (about 1 1/2 ounces) all-purpose flour; 12 ounces fontina cheese (preferably Fontina Val d'Aosta), grated (about 3 cups); 6 ounces Gruyère cheese, grated (about 1 1/2 cups); 8 ounces mascarpone cheese; 1 ½ teaspoons soy sauce; ½ teaspoon black pepper; ½ teaspoon ground mustard; ⅛ teaspoon ground nutmeg; ¾ cup panko (Japanese-style breadcrumbs); 1 ounce Parmesan cheese, grated (about 1/4 cup); 1 teaspoon grated lemon zest (from 1 lemon); ½ teaspoon paprika