Function：

Instructions：

1. Soak the Nanjing duck kidneys in water for about 20 minutes, rinse thoroughly and cut them into slices for later use;
2. Soak the sweet and bitter almond kernels in water for 1 hour; soak the aged dried mandarin peel in water, remove its vein and rinse thoroughly;
3. Soak the watercress in water for a while and rinse thoroughly; rinse the grosvener momordica fruit for a while for later use;
4. Cut the spareribs into big pieces, cook them in hot water for a while and rinse thoroughly for later use;
5. Put all ingredients into a casserole, pour in some hot water, turn to low heat after boiled; continue to boil for about 3 hours, add salt before serving.