I always have a small jar of homemade pesto in my fridge which I use on occasions when I need to magic up a meal within 15 minutes. I make this dish of pasta with pesto and halloumi  quite often, particularly when I also have some leftover roasted/grilled veggies or jarred roasted peppers. It can be ready in just 12 minutes, or less if you use gluten-free pasta. You can use/add other leftover/jarred veggies too (such as courgette, aubergine, onion and so on). This dish is nice cold too, so you can take it to picnics, trips, work/school in your lunchbox. Ideal for parties too.