Mahi mahi filets should be cut into strips and dried with paper towels. In a bowl, combine the breadcrumbs, Mexican spice, salt, and pepper.
In a separate dish, crack the egg and whisk it to include the yolk and white.In a third bowl, add the flour.The fillets are coated in flour, then are dipped in the egg mixture and then are breaded on both sides.
One or two at a time, cook them in hot oil heated to 350°F (180°C) for 3–4 minutes on each side, or until golden brown.Transfer to a wire rack or plate covered with paper towels to drain any extra oil.Serve the sauce for dipping with the fried mahi mahi after thoroughly combining all the ingredients in a bowl.