Tasting a bit like spinach or chard, nettles have a unique flavour - earthy & pungent, and once they are cooked the sting is destroyed. I have found the best way to cook them is to stir fry/ sauté them similar to the way you cook chinese leaf when making a stir-fry. This way they also don't take long to cook - maybe a minute or so - and the less you cook vegetables the more nutrients you save. Also when you sauté them some of the nettle leaves will brown slightly - that caramelisation gives you a wonderful flavour.
Tapioca I do have to admit is something I have never cooked before, so it was really interesting to try for the first time. When I mentioned tapioca to my parents they both said "eww, frogspawn!". Tapioca was popular in school dinners in times gone by - it's great comfort food, a bit like rice pudding. Anything that's like rice pudding has to be good!