Saute bacon in a large soup pot over medium-high heat until crispy, 3-4 minutes. Remove the bacon from the pot and place on a plate. Drain all but 1 tablespoon bacon grease from the pot. If there is not 1 tablespoon, then don't drain the bacon fat. Add diced onions and celery to the bacon grease in the pot. Saute over medium heat until soft, 3-4 minutes.Add potatoes. Saute 1-2 minutes. Reduce the heat to low.
Add the flour and stir, cooking until the flour is completely moistened. Add the milk and increase the heat to medium. Heat the soup until it is steaming, but just before it starts to boil, stirring often.
Keep the soup at this point until the potatoes are nearly tender, uncovered, 10 to 15 minutes. (Reduce the heat if the milk starts to foam.) The soup should start to thicken to a nice consistency. Add the fish, shellfish, corn and bacon.
Continue to heat, just below boiling for an additional 5 to 10 minutes, until the fish is cooked through. Add salt and pepper. Adjust seasoning if necessary.
Serve with the fresh parsley, crackers or good quality bread.
Use whatever seafood you'd like! I love using firm white fish like Pacific cod or tilapia. I find it holds its shape really easily and cooks well.
Make sure your fish is chopped up evenly. To ensure consistent cooking time, try to make sure your fish is cut into similar sizes. If a few pieces are larger or smaller, the fish won't cook at the same time.
There is a fine line between simmering and boiling! When adding the milk, you want to avoid boiling the milk, instead, you want to keep it at a consistent temperature to allow it to thicken.
Your choice of bacon will determine how much bacon fat is required to saute the onion and celery. We used smoky bacon that did not have a lot of fat on it. Therefore we kept all our bacon fat for frying and didn't need to remove any or add any additional oil.
Don't overcook your seafood! I found 5 to 7 minutes was an adequate cook time for my shrimp and fish. Shrimp will turn a beautiful orange color when cooked. The fish should be soft and cooked all the way through, if the pieces are consistent it should take the same amount of time as the shrimp.