When cooking vermicelli, don't wait until the water boils. Instead, there should be small bubbles rising from the bottom of the pot, then stir it a few times, cover it, add some cold water when the water in the pot boils, and it will be cooked when the water boils. In this way, the noodles are cooked quickly, and the noodles are soft and clear. On the contrary, if the water is boiled before the vermicelli is dry, the surface of vermicelli is easy to stick, and water and heat cannot penetrate and conduct quickly. In addition, boiled water makes the noodles roll up and down and rub against each other, so the cooked noodles stick hard outside and sticky inside.