Wash kale. Don’t dry as the water will help it steam. Cut into ribbons about 2cm (1in) or finer across the stem.
Heat a generous glug of olive oil on a medium heat in a largish saucepan. Add kale, garlic, rosemary and a few tablespoons water to the pot. Cover and cook stirring every few minutes until the kale has wilted down. Will take about 5 minutes. If it starts to burn or is taking too long add a little more water to help make more steam.
Remove from the heat and season generously with salt and pepper. See below for usage / serving ideas.