分离蛋黄。 将蛋黄放在装水的炖锅里。 煮至沸腾。 关火，等待一会。 冷冻之前过滤。

I'm interested in that, but I only have a few mins. Can you give me at most the first 500 characters of a detailed explanation in English about that?
The hard boiled yolk can be frozen with the appropriate preparation. The boiled egg white, however, will turn rubbery, tough, and damp when frozen, making it unpleasant to eat. Pull apart the egg whites and eat or discard them, leaving only unbroken hard boiled egg yolks. Carefully place the egg yolks at the bottom of the pan in a single layer. Cover with enough water to fill the pan at least 1 inch (2.5 cm) above the top of the eggs. Bring the water to a boil quickly. Cover the pan to speed up