In a small bowl, whisk all of the ingredients for the hummus lemon sauce. Set aside.
In a large mixing bowl, combine the grated potato and apple. Make sire to squeeze as much liquid out and drain. Add the rest of the ingredients and mix to combine.
Heat a non-stick pan. Lightly oil. Shape the mixture into patties. Cook for 2-4 minutes per side, until golden brown and crispy. Transfer to a plate with a paper towel to cool.