Harissa lamb tacos

Method

1. Heat the oil in a large frying pan, add the lamb mince and season well. Fry, breaking up with a wooden spoon, for 5 minutes over a medium-high heat. Stir in the onion and fry for another 5 minutes, stirring, until the lamb is nicely browned and the onion is softened. Stir through the harissa and cook for a couple more minutes, then pour over the water and simmer for 10 minutes until sticky. Squeeze over 2 of the lime quarters.
2. Meanwhile, heat the taco shells according to the pack instructions and stir the chopped mint into the yogurt. Spoon the harissa lamb into warmed tacos and top with shredded lettuce. Serve with the mint yogurt, olives and remaining lime wedges, and sprinkle over a few whole mint leaves to garnish.