asparagus- it is in season now.
Water cress- I have discovered that you can lightly stir fry this with a little garlic and it is really yummy. I like it in sandwiches with cream cheese too or in a salad.
Also, I learned in nutrition class the other day that many of the good nutrients in a green veggies like this or broccoli need to be consumed with some fat in order to absorb some of the vital nutrients. So do put on some salad dressing, preferably with olive oil or go ahead, have a little butter.