Set the pan on medium heat and add the oil. Cut up the onion and garlic and add them to the pan. Sauté for one minute.
Heat your oven to 400°F. Remove the tuna from the cans and mix it with the cooled veggies, almond flour, eggs, mayonnaise, lemon juice, parsley, dill, salt, and pepper.
Shape this into a ball with your fingertips and place on a parchment-lined baking sheet. Bake tuna meatballs for 20–25 minutes until lightly browned.