To avoid a fishy or bitter taste in seafood broth, use only bones and shells from mild-flavored fish, cook for a short time (around 30 minutes), and avoid using the gills or any dark, bloody parts.
Creating a delicate and flavorful seafood broth requires careful attention to detail. The key is to extract the essence of the seafood without overcooking it, which can lead to undesirable flavors. Here's a step-by-step guide:
Choose the Right Ingredients: Opt for bones, heads, and shells from mild-flavored white fish like cod, flounder, or sole. Shrimp and lobster shells can also add depth. Avoid oily fish like salmon or tuna, as they can impart a strong, overpowering flavor.
Prepare the Seafood: Thoroughly rinse the bones and shells under cold water. Remove any gills or dark, bloody parts, as these are often the source of bitterness and fishiness.
Sauté Aromatics (Optional): In a stockpot, lightly sauté aromatics like onions, celery, and carrots in a little oil or butter. This adds a layer of complexity to the broth. Avoid browning them too much, as this can also contribute to bitterness.
Add Seafood and Water: Place the prepared seafood bones and shells into the pot with the aromatics (if using). Cover with cold water. The water should just cover the ingredients; too much water will dilute the flavor.
Simmer Gently: Bring the water to a gentle simmer over medium heat. As soon as it simmers, reduce the heat to low. Avoid boiling, as this can make the broth cloudy and bitter.
Skim the Surface: As the broth simmers, impurities will rise to the surface. Skim these off with a spoon to ensure a clear and clean-tasting broth.
Short Cooking Time: Simmer the broth for no more than 30 minutes. Overcooking extracts undesirable flavors from the bones and shells. For shrimp or lobster shell broth, 20 minutes may be sufficient.
Strain Carefully: Strain the broth through a fine-mesh sieve lined with cheesecloth. This removes any remaining solids and ensures a smooth texture.
Cool and Store: Cool the broth quickly in an ice bath before storing it in the refrigerator or freezer. This helps prevent bacterial growth.
Don't add salt to the broth while it's simmering. It's better to season the broth when you're using it in a recipe, as the flavor will concentrate as it reduces. This prevents the broth from becoming overly salty.