The broccoli absorbs the umami from the manila clams and is very delicious.
Manila clams steamed in sake wasn't hearty enough, so I added broccoli and it turned out delicious because the broccoli absorbs the umami from the manila clams.
Make sure not to heat up too much after the clams have opened up (because they will become hard). You can enjoy the soup in pasta.
Enjoy Japanese food around the world.