Step 1

Season kingfish with salt and pepper.

Step 2

Heat 2 teaspoons oil in a frypan over medium-high heat. Cook fish, skin-side down, for 3 minutes, then turn and cook for a further 3 minutes or until cooked through. Transfer to a plate, cover with foil and rest while you make the sauce.

Step 3

Heat remaining oil in the same pan over low heat. Add garlic, lemon zest and a little salt and pepper and stir for 2-3 minutes until soft but not coloured. Stir in tomato, anchovy, capers, vinegar and sugar, then partially cover. Cook for 3-4 minutes until tomato softens. Stir in olives and parsley.

Step 4

Serve fish with sauce and baby spinach.