2, practice: egg yolk and powdered sugar together; Beat the egg yolk until the volume expands, the color becomes lighter and thicker, add a little salad oil, and beat with an eggbeater until the oil and egg yolk are completely blended; Then continue to add a small amount of oil, while stirring, the egg yolk paste will become thicker and thicker, then repeat this point, add salad oil and stir thoroughly; Add about 80 grams of oil, and the yolk paste will be very thick. At this time, add 1 tbsp white vinegar and mix well. After adding white vinegar and stirring, the salad dressing will be diluted, then add a small amount of oil and stir repeatedly, then add white vinegar and stir until all the oil and vinegar are added and the stirring is completed.