DS, 6 months starts nursery in a couple of weeks and has to take prepared food. I'm trying baby led weaning, but can't cook. Today I messed up steamed broccoli and sweet potato (went to mush). What foods (single foods, not recipes) can be chopped /cooked ready to eat and packed up without going horrible and brown before mealtimes? E.g. Is there a way of getting avocado to keep once chopped? Will steamed sweet potato be OK if I make it the night before?