1.Soak four bamboo skewers in cold water (to prevent them from burning). Meanwhile, using a sharp knife cut any skin away from the fish steaks, then cut the steaks into 2 cm cubes.

2.Grate the zest and squeeze the juice from one of the lemons. Combine this zest and juice with the olive oil and garlic. Finely chop the basil leaves and mix into the marinade. Cut each of the remaining lemons into four wedges.

3.Halve the zucchini lengthwise and score the white flesh with the tip of a sharp knife to make a crisscross pattern.

4.Lightly brush the cut surfaces of the zucchini with some of the marinade, then set aside. Mix the swordfish cubes into the rest of the marinade and leave for 5–10 minutes to absorb the flavours.

5.Thread the swordfish cubes and the lemon wedges onto the soaked skewers. Arrange on a cast-iron, ridged grill pan along with the zucchini. Sprinkle with coarsely ground black pepper then cook for 10–15 minutes, turning the skewers occasionally to make sure they are thoroughly cooked. Baste with the remaining marinade. (Alternatively, grill on a rack under a preheated barbecue.)

Variations• Change the flavour of this dish by alteringthe marinade. For an Asian flavour, use the zest and juice of 11⁄2 limes instead of the lemon, use cilantro instead of basil, and add chopped red chili pepper to taste. Use lime wedges on the skewers, and grill quartered red and green peppers alongside the fish instead of the zucchini. • Other fish that work well in this recipe include salmon and raw jumbo shrimp.

Serves 4

Preparation time 20 minutes, plus 10 minutes marinating

Cooking time 15 minutes

Each serving

25 g protein • 19 g fat of which 3 g saturates • 2 g carbohydrate • 2.5 g fibre • 295 Calories