abstract agriculture carbohydrate cooking cut dusky-purple-skin farming food freshness halved healthy heart-shaped potato potatoes raw root royal-blue-potato shape shapes solanum-tuberosum spud surface surfaced surfaces texture textured textures tuber uncooked unpeeled vegetable versatile yellow-flesh appearance background brown caps color colour cream dark dry edible field-mushrooms fleshy folded folds fresh fungi Gills large mushroom mushrooms quality quantity smooth soft stalk stem variations vegetables white wrinkled fawn beneficial bulk crunchy health ingredient kernel kernels medicinal nutritional nutritious nutty pepitas popular pumpkin pumpkin-seeds seeds surfacing sweet unhulled unhulled-whole-seeds abundant allium aromatic brown-onions bulb bulbs cirus-fruit clove cloves condiment culinary cultivars flavor flavoring flavour flavouring fruit garlic green ingredients limes natural-foods onions papery peel produce purple quantities red-onions size skins Spanish-onions supply variety