Fish and Chips with Tartar Sauce

Name: Fish and Chips with Tartar Sauce
Ingredients: 1 Cup almond flour; 1½ Teaspoon sea salt; 1/3 Teaspoon cayenne pepper; 1-2 large eggs, beaten; 1 Pound skinned white fish fillets, 3/4-inch thick, cut into sticks 1-inch wide and 2½-inches long; Extra-virgin olive oil; Lemon wedges, to serve; 2¾ Pounds celeriac, skin cut off; Finely grated zest of 1 lemon (optional), plus 1 tablespoon lemon juice; 2 Tablespoons extra-virgin olive oil; 2 Tablespoons unsalted butter; Sea salt and freshly ground black pepper; 1 level teaspoon grainy mustard; 1 level tablespoon finely chopped pickles; 1 level tablespoon finely chopped capers; 1 heaping tablespoon finely chopped flat-leaf parsley; 2/3 Cups mayonnaise