shrimp and crab chowder

Ingredients:

• 2 tablespoons butter
• 1 onion, diced
• 2 stalks celery, diced
• 2 carrots, diced
• 2 cloves garlic, minced
• 2 tablespoons all-purpose flour
• 4 cups seafood or vegetable broth
• 2 cups diced potatoes
• 1 cup corn kernels (fresh or frozen)
• 1 cup heavy cream
• 1/2 pound shrimp, peeled and deveined, chopped into bite-sized pieces
• 1/2 pound lump crabmeat, picked over for shells
• Salt and pepper to taste
• Chopped fresh parsley or green onions for garnish