Following a demonstration at a local department store, we bought a blender and made the kids fruit smoothies (with spinach and kale in them) and strawberry ice-cream (including cabbage and courgette) !!
We were 'busted' some months ago, but fortunately the kids decided they liked the tatste anyway and so are still shovelling them down, and so any parental angst about the deception has largely been dispelled!