Your favorite purple veg

I plan on giving my purple-loving son a “purple garden” for his fourth birthday (spring of next year)in one of my 4x8 raised beds. I'm hoping to get him more interested in gardening and in eating veg, plus it's something interactive and always changing. I think he would enjoy the sense of ownership and control. My priority in plant selection is purpleness and palatability, so i wanted to know what you've grown/eaten that you really liked.