Open tuna cans and drain. Add to mixing bowl and shred with forks.
Dice egg with egg chopper or knife and add to the tuna.
Dice the celery and add to the mixture.
Add mustard and mayo and stir until well combined. Salt and pepper to taste.
Notes
Mayo: I use 1/4 cup of mayo but you can use more if you want your tuna salad more creamy.I love the celery for the crunch but you can exclude it if you like. Mustard: I add yellow mustard for the classic taste but you can update the taste with a dijon mustard. I also sometimes add 1 tsp of dried dill to the tuna salad for a little different taste.