apple crop Fir food harvest heritage odd old pink potato root solanum tuberosum strange tuber unusual variety vegetable basic carbohydrate colors colours common diet fibre minerals perennial potatoes skin small small potatoes spud staple starch starchy texture tuberous vitamins young shooting shoots appearance colored coloured compare comparison cooking culinary cultivars dicotyledonous edible enormous gigantic golden-sweet-potato healthy herbaceous-perennial-vine ipomoea-batatas kūmara kūmera large nutritional nutritious plant popular purple raw root-vegetable shape shapes size Sizes skin-colours skins surface surfaces sweet-potato sweet-potatoes textures uncooked varieties vine background cuisine