• 1 stick butter
• 1 small onion, chopped
• 4 green onions, chopped
• 2 ribs celery, chopped
• 1 pound Louisiana crawfish tails with their fat or 1 pound large (21-24 count) peeled, deveined Gulf shrimp
• 1 clove garlic, minced
• 1 tablespoon all-purpose flour
• 1 1/2 cups half-and-half
• 1 tablespoons minced fresh parsley plus additional for garnish
• salt and freshly ground black pepper to taste
• 16 ounces pasta of choice, cooked al dente, drained
• 1/2 cup grated Parmesan cheese

Pasta with Shrimp or Crawfish