I'm a big tuna fan and a big fan of the keto diet as well. It has changed my life. So here you have my own personal recipe that my husband didn't even notice wasn't the regular.
4 cans tuna in water (8 oz)
2 large eggs
1/2 small onion diced
Almond flour
Salt, pepper, and cajun seasoning to taste
Drain tuna as much as possible. I even squeeze it out in my hands. Put in a medium sized bowl. Add eggs, onion, and seasonings to taste. Mix well. Add enough almond flour that it will hold form when squeezed together. I used about 1/4 cup. Prepare a small bowl of almond flour for dipping. Heat up a skillet with about 1/8 inch oil in the pan (I used canola). Make patties the size you prefer. I made 3 toddler sized and 9 adult sized ones. After you make each patty, coat well with almond flour by dipping into the bowl. Brown on each side. Drain on papertowel.
I paired with baked broccoli that had heather salt, butter, and olive oil on it. It was a delicious meal!