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Yes I think so - take account of different cooking times (maybe get over that by cutting in diferent sizes?) I wouldn't put any cabbage type stuff in, unless it was a real cabbage dish, like gammon hock with cabbage, but any root veg is fine.
Mmm, yes - nice
leeks cut into tings/chunks
little white turnips, whole
canned sweetcorn
any kind of bean, from a can of baked beans to butter beans and red kidney beans
oh yum, I could get hungry just reading