Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to get buttercream to not curdle [title] Measure the ingredients carefully and exactly. [step] Ensure that the ratio of butter to sugar to liquids or flavorings is exactly right. If you have a little too much liquid (such as milk or vanilla extract) or not enough butter, the buttercream can curdle.

Ending1: Do not add more sugar, just enough. Most of the recipe calls for whole milk and blended, starter buttercream. Ending2: [title] Beat the mixture until light and fluffy. [step] Hold the two ingredients at shoulder-height or on a stand. Ending3: For extra flavor, measure out 1/2 teaspoon vanilla extract and 1/2 teaspoon ground cinnamon. [substeps] For chocolate buttercream, whole milk and milk (and epsom salt) will both curdle. Ending4: Use measuring cups and spoons or a digital scale for accuracy. [title] Limit the liquid in the buttercream.

Answer format: ending1/ending2/ending3/ending4