Cook the pasta according to the instructions on the pack. Add the green vegetable of your choice for the last 2 minutes of the cooking time, then drain.
Meanwhile, drain the halloumi and wipe it clean with a kitchen towel, then cut into 2cm cubes. Put these in a bowl.
Mix the harissa with the lemon zest &juice, then pour over the halloumi. Toss well, coating the cubes well.
Heat a drop of oil in a frying pan. When hot, add the halloumi cubes together with the marinade. Fry them until golden on each side.
Put the drained pasta and green vegetable into a large serving bowl. Add the olives, cherry tomatoes (halved), halloumi and herbs. Drizzle with some lemon juice ( you can grate some lemon zest over it too), then toss and serve.