Shrimp and Corn Chowder With Fennel

From Real Simple.
Ingredients:
2 Tbsp. unsalted butter
2 leeks (white and light green parts), chopped
1 fennel bulb, chopped
Kosher salt
Black pepper
2 Tbsp. all-purpose flour
1 8 oz. bottle clam juice
3 c. whole milk
1 lb. potatoes, peeled and cut into 1/2-inch pieces
3/4 lb. cooked, peeled, and deveined medium shrimp
1 10 oz. pkg. frozen corn
2 Tbsp. fresh flat-leaf parsley, chopped
2 Tbsp. fresh lemon juice
Fresh dill, for garnish

Heat the butter in a large saucepan over medium heat.
Add the leeks, fennel, 1/2 teaspoon salt, and 1/4 teaspoon pepper. Cook, stirring occasionally, until the vegetables are tender, 4 to 5 minutes. Stir in the flour.
Add the clam juice, milk, and potatoes and bring to a boil.
Reduce heat and simmer, stirring occasionally, for 12 minutes.
Stir in the shrimp and corn and cook until the potatoes are tender and the shrimp and corn are heated through, 3 to 5 minutes.
Stir in the parsley and lemon juice. Garnish with fresh dill.
Serves 4.