I cook green beans, noodles, and broccoli in one pot - noodles and green beans in water and I steam the broccoli in a sieve, hung over the pot (you can also add the broccoli to the water, cook it as long as the beans and noodles). Split the broccoli into florets, peel the thick stalk and cut into thick slices, wash, arrange the broccoli, florets-side-up on a sieve, which fits the selected pot, cover with a lid (it doesn‘t have to be a perfect fit). Broccoli, depending on the size of the florets, need to be steamed for about 8 minutes.