Sometimes you want to bake a cake quickly. Mix the ingredients, pour the batter into the tin and into the oven. If it wasn't for the butter. It's too hard to work with straight from the fridge. And bringing it to room temperature takes time. Refrigerator butter softens quickly if it is cut into pieces, placed between two sheets of cling film and beaten vigorously with a pastry roller. This causes the butter molecules to rub against each other, which generates heat and the butter becomes perfectly soft for baking in a flash.