Beets are great veggies to have around. Not only do they keep forever before you cook them, they keep really well in the fridge after you've roasted, peeled and chopped them. That makes them a great base for quick easy salads. Another thing about beets: they sure take a heck of a long time to roast...I roasted 4 medium golden beets in foil in a 400 degree oven for at least and hour and a half and they were still very firm. Be sure to do it the day before or you'll starve waiting for them to cook.
I equate watercress with vitality and energy, and it's packed with health benefits. It has a peppery flavor kind of like arugula, and between the stems and the leaves it adds interesting texture to salads.