Roast Cod with Persillade Crust

Persillade is one of the simplest French preparations and one of the most effective. Finely chopped garlic mixed with a generous amount of fresh parsley, pressed onto cod fillets as a crust, then roasted at high heat until the herb coating turns fragrant and crisp. Ten minutes in the oven is all it takes.

The breading technique matters. A light flour dust first, then egg wash, then the garlic-parsley mixture pressed firmly on all sides. That flour-egg base gives the persillade something to grip, so it stays put during roasting instead of sliding off.

The spinach wilts directly in the roasting tin after the fish comes out. All those residual pan juices, olive oil, garlic bits, and browned parsley fragments flavor the spinach as it collapses. Black olives scattered over the plate add a salty, briny punch that works beautifully with the mild cod.

Kitchen Tips

• Cut the cod into uniform pieces. The recipe specifies this for a reason. Even thickness means every piece finishes at the same time. Thin tail pieces will overcook while thick center cuts are still raw.
• Chop the parsley very fine. Coarse leaves won’t stick to the egg wash and fall off during roasting. The finer the chop, the better the crust adheres.
• Don’t overcook the cod. It should be just opaque and flake easily with a fork. Cod dries out fast, so check at 8 minutes.
• Wilt the spinach quickly. High heat, constant tossing, 30 seconds. You want it barely wilted, not cooked to a dark green mush.

Variations

• Breadcrumb persillade: Mix ¼ cup fine breadcrumbs into the parsley-garlic mixture for a crunchier crust with more texture.
• Haddock or halibut: Both work as substitutes. Halibut holds up even better to the high heat and gives a meatier result.