Place mackerel, approx. 300 g, ready to cook in a buttered ovenproof dish. Preheat stove to 220 °C.
Cut the spring onions, shallot and carrots into thin rings. Put the thyme, tarragon, celery, bay leaf spice, chervil, parsley, cloves and the prepared vegetables with the spices into a saucepan. Pour wine, vinegar and water, season lightly with salt and season with pepper.
Simmer over medium heat for a quarter of an hour. Then pour the hot broth over the mackerel form and steam in a 220 °C (heated) stove for 15 minutes.
Tip: Stock up on high-quality spices – it pays off!