Cultured butter is made using creme fraiche, which is fresh cream fermented with cultures ??? in a similar way to yoghurt. It lends the butter a slight tang. You can use fresh cream just as well, but in that case the butter will have a more sweet, creamy flavour. Both are prepared the same way. Our metod: While we used a stick blender's whisk attachment to churn our butter in minutes, my Mum mentioned the more traditional method of... shaking cream in a jar until there was a distinct "sloshing and thudding" sound ??? the point at which the fat solids had separated from the whey. Yield: 200ml creme fraiche makes around 100g cultured butter. Storage: wrap butter in cling film or wax paper and store in the fridge in accordance with your cream's use by date. Otherwise, you can freeze the log and cut chunks off as needed.