Stocks are flavorful liquids made by simmering bones, meat, seafood or vegetables in water. There are different types of stocks including chicken stock, white stock, brown stock, and fish stock. Key ingredients used in making stocks are bones, mirepoix (a mix of onions, celery and carrots), acid, scraps, and bouquet garni (tied herbs). Spices add flavoring while seasoning is used to enhance flavors.