Has anyone used the frozen variety of collard greens, mustard greens or kale? I've been using fresh forever, but today I ran across these in the frozen aisle. I bought one bag of collards and took them home to inspect. They are already cut up really fine, and if a touch of hot water is added, it only takes them about 15 minutes to thaw. I've been having problems getting fresh greens lately (I live in a small town w/a little supermarket) and thought this might be an option. Does anyone use these regularly...or does anyone know if frozen greens are as nutritious as fresh as long as you don't cook them?