One large cauliflower will serve about 4 people (mine weighed 1.5kg / 3.3 pounds). If you are serving less people, I still recommend roasting 1 whole cauliflower, because we may as well take advantage of the hot oven. If you are only serving half of the cauliflower, save the rest for a salad or another meal. I halve the cauliflower to speed up cooking time, but you could also cut into quarters to shave off more time. I roast it whole as I love how creamy and melty it gets in the centre, with a golden, smoky exterior. If you don’t have lentils, you can sub in another legume such as chickpeas or white beans, or opt for farro or quinoa.