Preheat oven to 375 degrees F.
In a
food processor add
hazelnuts and
pulse 4 times at 5-second intervals. Add
panko to the hazelnuts and pulse again for 10 seconds. Season the sole with salt and pepper, to taste, and lightly
dust the sole with flour, shaking off the excess. Dip the sole into
egg whites coating entirely, shaking off excess, press into hazelnut
breading. Refrigerate for 10 minutes or up to 24 hours. Heat a large saute pan on medium heat. Add 2 ounces
canola oil and the sole. Cook for approximately 1 minute, checking carefully with a
spatula to make sure they are golden brown. Flip and continue cooking for 1 minute longer and then transfer to
sheet pan. Repeat the process with the remaining oil and
sole.
Place the baking sheet in the preheated oven for 8 to 10 minutes (depending on thickness of
fillet) or until
fish is cooked through but still moist.