Ever tried beetroot chips? ... ridiculously expensive but very yum! ... they'd go well in a vending machine, together with sweet potato and parsnip. I tried drying some beetroot slices myself in the oven with a smear of olive oil & a sprinkle of rock salt when done and the kids ate them! Also, you can sneak heaps of veggies into a homemade pastie and all tastes nice wrapped in puff pastry ... kids have been eating them cold in their lunchboxes ... yes, filling a kids lunchbox can be a real challenge too!