This dairy-free eggnog can curdle quite easily if you're not careful! It's very important to add the warm milk mixture to the egg mixture slowly while in the blender and to keep your stovetop at a medium-low temp when heating. If the saucepan gets too hot or is left on the heat too long your eggnog will curdle. It's also important to constantly stir your eggnog while it's on the heat. If you skip this step it can cause the eggnog to curdle.