I usually get the "spring mix" that has a bunch of different kinds of roughage.
It sounds gross, but dandelion greens are EXTREMELY good for you (arguable the best geen leafy on the planet) they are a tad bitter, and you need to make sure they come from a place where they arent using fertilizer or chemicals. I switched my yard to 100% organic fertilizer and weed/insect control so I can eat the little bastards when they come up.
Here is some quick data I found, but is by no means complete.