Place the sweet potato cubes in a bowl, drizzle with 1 tablespoon of olive oil and season well with salt and pepper. Mix them with your hands to coat, place them on the prepared tray and roast for about 25 minutes. Step 2 Meanwhile, cook the pasta in a large pot of boiling salted water for 8-10 minutes, or until al dente. Step 4 Add the cooked pasta, sweet potato, cucumber, cherry tomatoes, olives, spring onion and pine nuts to a large bowl. Add the diced halloumi and pan-fry until caramelised and golden all over, 3-4 minutes.