Directions

• Preheat oven to 325 degrees F (165 degrees C).
• Place hazelnuts on a baking sheet and place into preheated oven. Bake until the skins loosen and the nuts turn a light golden-brown, 20 to 30 minutes. Remove from oven and allow to cool until you can handle them. Remove the skins by placing the hazelnuts into a kitchen towel, folding it over, and rubbing until the skins come off.
• Discard the loosened skins, and chop the nuts into very small pieces by hand.
• Whisk together lemon juice, hazelnut liqueur, sherry, and salt together in a bowl until the salt has dissolved. Whisk in pepper, 2 tablespoons lemon zest, and shallots; slowly pour in canola oil while whisking vigorously until completely incorporated. Pour into a resealable plastic bag or glass bowl; toss fish with marinade, then refrigerate 8 to 24 hours.
• Preheat an outdoor grill for high heat and lightly oil grate.
• Remove the salmon from the marinade, shake off excess, and discard remaining marinade. Cook on preheated grill 6 to 8 minutes per side, or until the fish is just opaque. Garnish with hazelnuts and lemon zest to serve.