Dilute vinegar: 50% white wine vinegar + 50% water.
Add: fresh coriander (stems), pink peppercorns, 40 grams sugar, red onion (thinly sliced), lemon (thinly sliced).
Heat to 60 degrees. Don't boil it.
Cool and add mackerel fillet, flesh side down. Marinate for 20 minutes.
Grill mackerel for 5 - 6 minutes (score the skin sideways).
Serve with soy sauce dressing.
50% soy sauce, 50% water. Fresh lime juice, ginger (julienne), dark sugar. Mix.
Serve on salad (rucola and fennel).