In a large bowl, mix together all of the ingredients except the avocado oil until well combined.
Divide the mixture into 8 equal portions. Form each into patties about 3/4 inch thick and place on a waxed paper lined tray.
In a large skillet, heat 1 tbsp of the avocado oil over medium heat until shimmering. Add half of tuna patties and cook until golden brown on the bottom, about 3 to 4 minutes.
Carefully flip over and cook the other side another 3 to 4 minutes. Remove to a paper towel lined plate and repeat with the remaining oil and patties.
Top with mayo, lemon, and capers, if desired.