I love dual purpose things like a milk cow that effectively produces meat, chickens and quails that lay eggs and make delicious eating, and radishes and beetroot because one can eat the leaves, too. For lunch I prepared beetroot leaves as a side but we ate it as a main course because it tasted terrific. I washed and and cut the stems off as close to the root as I could get without damaging the skin of the beetroot. I wrapped the beet and a bit of rosemary in foil and popped it in to the oven while my bread was baking. I fried some garlic and rosemary in a teaspoon full of olive oil, chopped the leaves and stems, coarsely and added them to the pan. after frying for a minute I added about 2 tablespoons of water and covered the pan. Cook until tender adding a bit of water when necessary. Delicious. I intend eating the beetroot tomorrow dressed with some balsamic vinigar salad dressing and shaved Parmigiana cheese.
I would like to know of other plants where roots/ fruits and leaves can be eaten.