Southern Lobster and Shrimp Mac and Cheese

Name: Southern Lobster and Shrimp Mac and Cheese
Ingredients: 1 (16 ounce) package whole wheat elbow macaroni; 0.5 cup dried minced onion; 1 pound cooked and cubed lobster meat; 1 pound cooked shrimp, tails removed; 1 (12 ounce) can evaporated milk; 1 cup heavy cream; 1 tablespoon all-purpose flour, sifted; 3 eggs; 1 stick butter; 2 tablespoons all-purpose flour; 1 pound shredded sharp Cheddar cheese; 1 pound shredded Swiss cheese; 1 pound shredded Monterey Jack cheese; 1 tablespoon dried onion seasoning (such as Pampered Chef® Three Onion Rub); 1 teaspoon herbes de Provence; 2 cups crushed buttery round crackers (such as Ritz®); 1 stick butter, sliced into pats