Sweet Potatoes vs. Yams: The Surprising Truth Behind the Labels

Sweet potatoes come in a wide variety of types, each with its own unique appearance and flavour. The confusion between sweet potatoes and yams in the U.S. has led to clearer labelling rules. Cooking methods can also change their texture and taste significantly. In the U.S., the term 'yam' was once used to distinguish soft, orange-fleshed sweet potatoes from firm, white-fleshed ones. This caused widespread confusion. The USDA now requires any product labelled as 'yam' to also state it is a sweet potato, as they are all the same plant family.

Sweet potatoes and true yams are botanically different. Yams are native to Africa and Asia, with white flesh. Sweet potatoes, native to the Americas, typically have orange flesh.

Varieties like Jewel have thin orange skin and bright orange flesh, offering a very sweet, fluffy texture. Garnet sweet potatoes feature reddish-purple skin and striking orange interiors, with a dense, sweet flavour hinting at plums and vanilla. Hannah sweet potatoes stand out with tan skin and light interiors, firm and creamy, with a honey-like taste. Japanese sweet potatoes have purple skin, pale yellow flesh, and a dense, creamy texture with a deep, honey-and-chestnut flavour. Purple sweet potatoes display ashy purple skin, vivid purple flesh, and a dry, dense texture with perfume and vanilla notes when cooked properly.

For the best flavour, baking sweet potatoes at a lower temperature (275°F) for around 2.5 hours allows starch to convert to sugars. Roasting them in halves offers a quicker method, producing a denser texture and a caramelised cut side. The USDA’s labelling rule helps clarify the difference between sweet potatoes and yams. Various cooking techniques and types offer distinct textures and flavours. This variety makes sweet potatoes a versatile ingredient in many dishes.