Cook the pasta in a saucepan of boiling salted water for 10–12 minutes or according to packet instructions. Meanwhile, place the tuna, pine nuts, harissa paste, lemon zest and juice, parsley ...
Drain the pasta and stir into the roasted vegetables. Stir through the mozzarella and pesto, top with Parmesan and return to the oven for another 10 minutes, until the cheese has melted.