Vegetable curry is easy, Lidl sell veg at a good price and they are fresh. In fact anything vegetarian is cheap: soup,curry,chilli..... Have you tried making pasties or pies? We had veg rice (Lidl 49p) fried with onion,kale and gammon for lunch....that was really nice and took five minutes. We also buy a jar of miso paste and make ramen really quickly and easily, adding different things.