Mince the celery, half of the radishes, and green onion and add to a large bowl. Thinly slice the other half of the radishes. Cut and peel an avocado into quarters and thinly slice the quarters.
Step 2
Add a can of tuna to the vegetables. Use the back of a fork to chop up the tuna.
Step 3
Add the mayo, lemon juice, dijon mustard, salt, and pepper to the tuna and mix well.
Step 4
Fold a piece of nori in half. Add ⅓ of the tuna mixture to the center of the tuna and top with a few slices of avocado and radish.
Step 5
Roll the nori slices up to make tuna handrolls. Repeat with the other pieces of nori and remaining tuna. Eat immediately.