Try growing beets for their sweet, mineral rich roots and tasty greens.  
They are one of the healtiest vegetables.  Their rich color comes from the pigment betacyanin, which is powerful in protecting against cancer, heart disease, and inflammation.  Beets are also full of iron, folic acid, calcium, potassium, magnesium,  phosphorus, sulfur, iodine, and vitamins B1, B2, and C.  They are a great antioxidant.