I've never tried sprout soup, but they're good in stirfry, too! I tried to grow my own one year, and failed (caterpillars, ugh), but I did notice that in the morning the plants could be black and dead-looking from the frost or snow (very light snow!) but they'd be bright and green and happy again in the afternoon!

I love the smell you get in cold weather, and that feeling of being all snuggled up in the warm while it's windy and sleeting outside :)