Finely chop the celery and add it to the bowl as well.
Add the rest of the ingredients - mayonnaise, dill relish, yellow mustard, celery seed, seasoned salt, and black pepper - to the bowl.
Mix all of the ingredients together.
Cover and refrigerate until ready to serve.
Leftover tuna egg salad can be kept in an airtight container in the refrigerator for up to 3-5 days.Stir before using. Salads containing mayonnaise don't freeze well.
It doesn't matter if the canned tuna is in water or oil, as this will be drained out before adding to the salad. Make sure to flake out the tuna when adding it to the bowl.
This recipe is best made with chilled hard-boiled eggs.
If you prefer dijon or honey mustard instead of yellow mustard, you can use them instead. Even try whole grain mustard for a delicious flavour.
Nutritional information is an estimate and provided as a courtesy. The values may vary according to the ingredients and tools that are used. Please use your preferred nutritional calculator for more detailed information.