Hi Kitty,
I personally cook mine,my greys tend to prefer warm cooked veg, Sweet potatoes, both the yellow and the orange varieties, can be feed raw . I boil mine then mash them.
Sweet potatoes are low in calories& high in fibre & carbohydrates.Sweet potatoes also contain the antioxidant beta carotene,They are rich in vitamin B6, C & pottassium, A good low fat source of vitamin E , so all in all a great one to feed our greys