Clean the rooster and cut into pieces. Bring to boil again, lower the heat, just let it boil very slow. If you cook on high heat, the soup won't be nice and clean. It is may develop some dark colored foam on top of the water. Just pick it up with a spoon.
Some cooks soak the beef a night before cooking in cold water in the fridge.
This helps to not develop the foam. If you used fresh vegetables add them all, when the rooster is half way cooked. If you use canned veggies, add before ready. Add the broken into sprigs cauliflower, and sliced mushrooms. When the meat is tender, take it out from the pot.