Yam - the thick, starch tuber of various tropical
vines native to Asia (genus Dioscorea) unrelated to the potato
and sweet potato; has an off-white to dark brown skin, flesh
that can range from creamy white to deep red and is less sweet
that a sweet potato.
Yarrow - an aromatic herb used in flavoring omelets,
stews and salads.
Yeast - a microscopic fungus that converts its food
(carbohydrates) into carbon dioxide and alcohol through a metabolic
process known as fermentation; yeast is necessary for making
beer, wine, cheese and some breads.
Yogurt - curdled or cultured milk dish with custard-like
consistency used in main dishes, in sauces and in desserts.
Yorkshire Pudding - a popover-like pastry cooked in roast
beef drippings, this is one of the great British inventions.
When cooked successfully, it puffs as high as a giant popover,
and is crusty and savory with the natural gravy of the roast.