i buy japanese organic ones from citysuper. it's vacuum packed in a box (like vitasoy milk). it's soft. it's very convenient cos you can keep it in the fridge for a while if you don't open it. once i opened it, i slide in into a ziploc box, fill it up with distilled water & keep at the back of the fridge. it can keep for 1 week. if you buy fresh ones from the market, it can only keep for 1 day.
i put it in a pot & cover with water then boil. remove from heat & add organic miso paste & stir. then mix with rice. yummy! or you can do a stir fry with chopped corn, a little soy sauce & sugar. or steam it with minced fish for 10mins (mince pork for 15mins).