Preheat the oven to 180C/160C Fan/Gas 4. Arrange the potatoes in an ovenproof dish large enough to accommodate the sea bream. Season with salt and pepper and drizzle with 2 tablespoons oil.

The mayonnaise would also work well with salmon or bream, and keeps in the fridge for ... To make the mayonnaise, in a bowl or food processor, whisk together the egg yolk, vinegar and a pinch ...