Mix all the tartar sauce ingredients together and refrigerate for at least 30 minutes for the flavors to marry. Use half the sauce for this recipe. Refrigerate the other half for up to one week.
Mix the tuna salad with the beaten egg, coconut flour, and flax seed.
Heat a small frying pan over medium heat. When the pan is hot, add the avocado oil.
Scoop the prepared tuna into two patties, gently shaping them with your hands.
Carefully place them in the hot pan. Cook them undisturbed on one side until the egg has set and they are starting to brown, about four minutes. Then turn them and cook them on the other side until they are browned, another two to three minutes.
Mix all the ingredients together and refrigerate for at least 30 minutes for the flavors to marry.
Serve the patties with the sauce and dill pickle chips.
Store in an airtight container in the refrigerator for up to one week.