In a large bowl, add Greek yogurt, Dijon mustard, vinegar, red onion, celery, dill, garlic, smoked paprika, salt and pepper. Stir well.
Drain cans with tuna thoroughly. I usually press hard onto the lid while draining the can completely.
Transfer to a bowl with Greek yogurt mixture. Separate into flakes with a fork and then mix well.
Refrigerate for about an hour to let flavors "marry each other".
Serve cold in a sandwich or over lettuce leaves.
Notes
Store: Refrigerate in an airtight container for up to 5 days.
What canned tuna to buy? I buy canned light tuna packed in water. Albacore tuna has less "fishy" taste and white "meaty" texture or yellowfin/skipjack/light tuna is tan to pink in color and has more strong fish taste. I always buy chunky one vs. whole because it's cheaper.