- 4 mackerel, butterflied, or 8 fillets, trimmed and pin-boned – allow approx. 150g per person
- 600g baby potatoes skins on
- 2 tablesp. Dijon mustard
- Salt and freshly ground black pepper
- 3 scallions, trimmed and finely sliced
- Lemon and chive dressing
- 4 tablesp. olive oil
- 1 heaped teasp. whole grain mustard
- 1 clove garlic, peeled and crushed
- 2 tablesp. lemon juice
- 2 level tablesp. fresh chives, finely sliced
- Zest of 1 lemon
- To serve: Steamed summer vegetables and lemon wedges