We called it cochineal when we were kids, and my Mom used to dye our Easter boiled eggs with it to get them to come out a bright cerise deep pink shells.
Well now, I wonder if we could use all sorts of food colouring with the white veges we get ... like cauliflower or parsnips or turnips? Orange cauli? Green parsnips? Bright yellow turnips? I wonder if leeks are worth a bash? Imagine some blue mash potato? Or purple rice?
I am going to try then I will report back. Won't you do so as well for fun and tell what the recipients of such a rainbow display say? Hah!