Macadamia Nut Crusted Halibut | Restaurant Recipe, Gluten Free & Keto-Friendly

If you have ever paid forty dollars for a piece of fish in a hotel dining room, this is the recipe that ends that habit. Macadamia nut crusted halibut takes about twenty-five minutes from cold pan to plated dinner, it is naturally gluten free, and at roughly four grams of net carbs per serving it fits a strict keto day without any negotiation.

I put this recipe in The Balanced Plate because it does the thing I care most about: it is a genuinely great dish first, and a low carb dish second. Nobody at your table needs to be told they are eating diet food, because they are not.

Why macadamia nuts work better than breadcrumbs

Macadamias are about seventy-five percent fat and very low in carbohydrate, which means they brown the way breadcrumbs brown but they do it with butterfat instead of starch. That fat is also what protects the halibut. Halibut is famously lean and famously easy to overcook, the nut crust acts as insulation, so the fillet steams gently underneath while the top goes deep gold.

• Roughly 1.5 g net carbs per ounce of macadamia nuts, versus about 20 g for the same weight of panko.
• High smoke-point fat, so the crust browns before the fish dries out.
• Naturally gluten free, no cross-contamination worries for celiac guests.

Ingredients

• 4 halibut fillets, 6 oz each, skin removed, patted very dry
• 1 cup raw macadamia nuts, pulsed to a coarse crumb
• 1/4 cup finely grated parmesan
• 2 tbsp almond flour
• 2 tbsp Dijon mustard
• 3 tbsp unsalted butter, melted
• 1 tbsp chopped fresh dill (plus more to finish)
• Zest of 1 lemon
• Kosher salt and freshly cracked black pepper

Method

1. Heat the oven to 400°F (205°C) and line a sheet pan with parchment.
2. Pulse the macadamias in a food processor to a coarse crumb, stop before they turn into butter. Toss with parmesan, almond flour, lemon zest, dill, melted butter, a big pinch of salt and plenty of pepper.
3. Dry the halibut thoroughly. Wet fish is the number one reason a crust slides off. Season both sides.
4. Brush the top of each fillet with a thin, even layer of Dijon. This is the glue.
5. Press the macadamia mixture onto the mustard, packing it firmly so it holds together.
6. Bake 12 to 14 minutes, until the crust is deep gold and the fish flakes at 130°F (54°C) internal. Rest 3 minutes before serving.

How to keep the crust from falling off

Three things, in order of importance: dry the fish, use the mustard layer, and press the crumb on hard. If you are working ahead, crust the fillets and refrigerate them uncovered for up to two hours, the cold sets the butter in the crumb and it bakes on even more securely.

What to serve with it

Baked creamy spinach (page 165 of The Balanced Plate) is the classic pairing and adds only four grams of net carbs. Roasted cauliflower or a simple lemon-dressed arugula salad both work. If you are cooking for a mixed table, a small bowl of rice pilaf on the side lets the non-keto eaters have their starch without you cooking twice.

Storage and reheating

Leftovers keep three days refrigerated. Reheat in a 325°F oven for eight minutes, never the microwave, which turns the crust to paste. The crust also freezes well as a raw mixture; portion it flat in a freezer bag and it keeps for three months.

Balance is not about removing things from the plate. It is about choosing what earns its place there.