The subtly flavored, firm flesh of winter melon takes well to the savory notes in this broth. You may find winter melon at pan-Asian markets; otherwise, substitute peeled and seeded chayote squash, which is widely available at Latino markets.
Soak in warm water for 20 minutes:
Drain and chop, then add to a large saucepan with:
Bring to a boil, then cover, reduce the heat, and simmer until the winter melon is very tender, 15 to 20 minutes.