Tuna Noodle Casserole with Leeks and Fresh Dill

Name: Tuna Noodle Casserole with Leeks and Fresh Dill
Ingredients: 1/4 cup (1/2 stick) unsalted butter; 2 1/2 cups thinly sliced leeks (white and pale green parts only; from about 2 large); 1/4 teaspoon celery seeds; Coarse kosher salt; 1/4 cup all purpose flour; 2 cups whole milk; 1/2 cup half and half; 1 teaspoon fresh lemon juice; 8 ounces wide egg noodles; 1/2 cup coarsely grated Gruyère cheese (about 2 1/2 ounces); 2 tablespoons chopped fresh dill; 2 5- to 6-ounce cans albacore tuna (preferably packed in olive oil), drained, broken into 1/2-inch chunks; 2 cups coarsely crushed salted potato chips (about 2 ounces)