Nectarines are a cross between peach and plum. Nectarines have a sweet flavor that is similar to peaches but slightly sweeter, softer, juicier, and smaller than peaches. Nectarines are generally eaten fresh out of season, but they can also be frozen or canned. Nectarines are often considered a dessert fruit, but they are also perfect for breakfast or snacks. Nectarines are high in vitamin A, fiber, folate, and potassium.