Remove the broccoli florets.
Trim the base of the stalk, You shouldn't need to remove much.
Remove the florets.
Chop the trimmed stalk into small pieces - this will help them cook at the same rate as the florets.
Melt the butter and lightly fry the cumin seeds for a few moments to release their oils.
Add all the broccoli and about 100ml of water to the pot.
Simmer gently until the broccoli is breaking up. Add a little water if it gets dry.
Your aim is to evaporate the water as the broccoli cooks so that you end up with a moist mash.
When cooked, mash to remove any remaining lumps and season to taste.