Wikipedia Article About Persian walnuts on Wikipedia The Persian walnut has a wrinkled, tan-colored shell that encloses two large, double-lobed halves. Its sweet flavor makes it a delicious choice for out-of-hand eating, as well as a popular addition for all manners of foods sweet and savory. English walnuts are used to produce walnut oil; they also come in candied and pickled forms. Persian walnuts are a potent source of Omega-3 oils.