1 Heat the oven to 200°C (180°C in a fan oven), 400°F, gas 6 and line a baking tray with grease-proof paper.
2 Purée the wild garlic with the oil then mix with the egg yolk, butter and parmesan. Mix in enough breadcrumbs that the mixture has a spreadable texture. Season with salt and ground black pepper.
3 Place the fish on the baking tray. Top with the herb crust, pressing down well. Bake for around 15 minutes.