Using a 5 qt pot, melt the butter. Then add onions and celery and cook for a few minutes until they are soft but not brown.

Whisk in the flour and cook for one minute. Using medium heat add in the half-and-half. Stir every few minutes until thickened. At this point choose the consistency that you like the best. You may need to add a little bit more milk if it's too thick. Then add the old Bay seasoning. I use approximately 3 tablespoons for my taste more or less for your own.

While the cream mixture is thickening clean the shrimp and chop them into pieces. I usually cut each shrimp into 3 pieces. When your soup base is consistently thick and starts to bubble add the shrimp. Cook for 5 minutes.

After the shrimp are cooked thoroughly add your crab And cook for additional 5 minutes.