Just use the other three:

Soak the black fungus first and tear it. Slice carrots. Slice wax gourd.

Put water in the pot, add black fungus and wax gourd, cook until wax gourd is easily broken by chopsticks, and then put carrots. Just add some salt, onion and chicken essence. If there is rice, it is also good to put some rice in it to cook.

It seems that it is not easy to lose weight in winter. If possible, add some chicken to the soup and cook it properly, which will be healthier and more delicious.