Drain the tuna and transfer the meat to a bowl. Add the eggs, 2 tbsp chopped parsley, garlic powder, 1 tbsp mayonnaise, almond flour, coconut flour, lemon zest, and a pinch of salt. Mix until well combined.
Add 1 tbsp of oil to a nonstick pan and place it over medium heat. Divide the tuna into 2 portions and shape them into round patties. Gently lay them into the oil.
Cook the tuna patties for 3-4 minutes on each side. Transfer them to a plate. Tear the lettuce and arugula into bite-sized pieces and transfer them to a serving dish.
Thinly slice the onion, and finely chop the parsley. Add them to the greens. Transfer the plate to the fridge until serving time.
To make the dressing, add 2 tbsp mayonnaise, 1 tbsp avocado oil, cilantro, lemon juice, 1/8 tsp salt, and red pepper flakes to a jar. Blend using a hand blender until smooth. Taste and adjust the seasoning to your liking,
To serve, arrange the tuna patties on top of the salad. Drizzle the dressing on top. Garnish with hemp seeds and serve immediately.