So, I know one can give things like romaine lettuce and broccoli (which part of broccoli?) to Tangs. What the recipes? I've seen one that says "frozen." Do you just freeze a piece and then defrost it and put it into the tank? Or is there more to it? Also I've seen "boiled." I'm wondering if in the process of cooking you're not cooking the vitamins out of the veggies.