Celery Shrimp Bisque

Ingredients

• 2 cups peeled diced potatoes
• 2 cups chopped celery
• 2 cups water
• 1/2 cup chopped onion
• 1 teaspoon salt
• 1 teaspoon pepper
• 4 cups half-and-half
• 1/4 cup flour
• 1 lb medium shrimp, cleaned
• 1/4 cup butter
• 1/2 teaspoon celery salt
• 1/4 cup dry sherry