I Found this growing in a vegetable bed this summer
the bed is made up from mostly compost (from a compost bin) that a friend didn't want, they had just moved into the house and therefore cant tell me what went into the compost bin.
i have had all sorts of free plants from this bed so far but have no idea what this is (see attached)
The plant is over 30cm high with a main thick straight stem 8mm across and a sort of crown of leaves with originally one central flower now four flowers coming off that central stem.
they are white flowers about 4-5cm long, they dont seem to open very far about 8cm across (like and seem fairly flimsy, but that maybe because they are in a green house) and only seem to stay open one day
I'm sort of hoping it will be some sort of vegetable, i have auberguines and squash trhat have come from this compost heap