Peel and thinly slice the yellow onion into half-moons. Place them in a bowl and sprinkle with a pinch of the sea salt, tossing to coat.
In a medium mixing bowl, combine the ground turkey, chickpea flour, cumin, coriander, turmeric, remaining salt, and black pepper.
Add the sliced onions to the turkey mixture and use your hands to thoroughly incorporate until the onions are evenly distributed and the mixture is cohesive.
Divide the mixture into 4 equal portions and shape them into flattened patties (fritters).
Heat the avocado oil in a large non-stick skillet over medium heat. Once hot, add the fritters to the pan.
Cook the fritters for 4-5 minutes per side until they are golden brown, crispy on the outside, and the turkey is fully cooked through.
While the fritters cook, whisk together the Greek yogurt, lemon juice, and chopped fresh cilantro in a small bowl to create the dipping sauce.
Serve the hot fritters immediately with the chilled yogurt sauce on the side.