This is a great dish to make in a big batch so you can store some store in the freezer for another meal. When cutting the broccoli, almost shave the green tops off, separating as much of the stalk as possible. As they cook they lose their color. By adding the tops at the end the soup regains some of the bright green color.
To make it to your taste, you can add other spices or flavors like garlic or hot pepper flakes.