½ pointed cabbage, leaves cut into 3cm/1¼in squares
1 bunch chives, snipped
1 lemon, cut into wedges
8–12 baby new potatoes
1 bunch parsley, chopped
1 tbsp chopped red onion
2 tbsp capers
3 tbsp wholegrain mustard
salt
4 tbsp butter
4 eggs
4 tbsp soured cream
4 mackerel fillets