Tuna Noodle Casserole

Name: Tuna Noodle Casserole
Ingredients: 1 medium onion, finely chopped; 4 1/2 tablespoons unsalted butter; 10 oz mushrooms, trimmed and sliced 1/4 inch thick (4 cups); 2 teaspoons soy sauce; 1/4 cup Sherry; 1/4 cup all-purpose flour; 2 cups low-sodium chicken broth; 1 cup whole milk; 2 teaspoons fresh lemon juice; 1/4 teaspoon salt; 1 (6-oz) can tuna in olive oil, drained; 6 oz dried curly egg noodles (preferably Pennsylvania Dutch style; about 3 1/4 cups); 1 1/2 cups coarse fresh bread crumbs (from 3 slices firm white sandwich bread); 4 oz coarsely grated Cheddar (1 cup); 1 tablespoon vegetable oil