Ingredients

• 1 tablespoon plus 1 teaspoon neutral oil, such as canola or avocado, divided

• 2 cups sliced leeks, rinsed (about 2 small)

• 1 cup sliced celery

• 2 large white potatoes (about 1 3/4 pounds), peeled and cut into 3/4-inch pieces

• 2 cups seafood stock or clam juice (see Tips)

• 2 teaspoons Old Bay seasoning, divided

• ½ teaspoon freshly ground pepper

• 1 cup low-fat milk

• ¼ cup all-purpose flour

• 1 tablespoon Dijon mustard

• 1 pound raw shrimp (21-25 count), peeled, deveined and chopped (about 2 cups; see Tips)

• 12 ounces diced cod (see Tips) or other firm white fish

• 8 ounces pasteurized crabmeat, preferably jumbo, drained

• 2 cups shredded Gruyere cheese, divided

• 2 tablespoons chopped fresh dill or 2 teaspoons dried, divided

• 1/2 cup coarse whole-wheat breadcrumbs (see Tips)