I made good brussels ONCE. I have the recipe and tried to do it many times, never could make them good again, always too bitter. I know it's possible but I'll wait a decade for stars to align again.
Had both. So many people here have recommended different Brussels sprout recioes that I want comment on this. But steamed or boiled broccoli just sucks compared to seared or roasted.
And my go-to is to make Carbonara, but replace the Lancaster/Guanciale with 2-3 of the outer, leathery savoy leaves cut into black width strips (vegetarian carbonara, basically).
Another option:
Green cabbage, steamed with butter melted over the top while its hot.
And cauliflower? Have you not heard the good word about cauliflower cheese bake?