Whip egg whites with lemon juice until fluffy and set aside.
In a bowl, add almond flour, lemon zest, sugar, baking powder, arrowroot powder or corn starch. Sift ingredients together.
Add egg yolk, butter, milk of choice and vanilla and stir until well mixed.
Gently fold in the egg whites and stir until just mixed, don't over mix.
Gently pour batter onto a greased and heated griddle and cook until the one side is golden brown, make sure it is cooked enough or it will be messy to flip.
Gently flip over and cook on the other side, to cook the sides, place a pan or bowl over pancakes while cooking so the heat helps cook the sides of the pancakes.