Purple Sweet Potatoes

pat frederick Food March 25, 2024March 25, 2024 3 Minutes

I found this article on The SpruceEats website about purple sweet potatoes:

Purple sweet potatoes (sometimes mistakenly called purple yams) are fun to cook with and can be used in many of the same ways as the more familiar orange or white sweet potatoes. Though some varieties have white skin, cutting one open will reveal their violet-colored surprise. Popular in some Asian and Latin cuisines (but not to be confused with Japanese sweet potatoes), they add a brilliant pop of color to food and require just a few adaptations to cook.

What Are Purple Sweet Potatoes?

Purple sweet potatoes are root vegetables. The tubers taper to points on both ends and are members of the Ipomoea genus, just like other sweet potatoes (yams are of the genus Dioscorea). There are two main varieties—Okinawa (white skin) and Stokes (purple skin)—though they share the characteristic of having a deep purple flesh. The color comes from anthocyanins, the same pigment that gives cherries, strawberries, purple carrots, and other vegetables their color. These sweet potatoes are easy to prepare and cook. They’re not as easy to find as regular sweet potatoes and are more of a specialty item, so they will cost a little more.

Sweet potatoes that have brown, red-orange, or white skin with orange or white flesh are native to Colombia and southern Central America. After Columbus’ discoveries, they were brought to Asia, and varieties with white skin and speckled pale purple flesh were developed on the Japanese island of Okinawa. Today, they are widely grown in Hawaii and exported to the United States mainland where they are popular with Asian and Latinx communities.

How to Cook with Purple Sweet Potatoes

Purple sweet potato skins are edible, though some recipes recommend peeling them first. When cooking, purple sweet potatoes will take longer than regular sweet potatoes. You will need to bake them anywhere from 90 minutes to 2 hours at 350 F to make them pleasingly moist.

Purple sweet potatoes are wonderful boiled, steamed, or baked alongside regular sweet potatoes. They can be used in many of the same ways you’d use an orange or white potato, and the colorful result puts a fun spin on mashed potatoes, fries, and soups.

If you’re going to use this sweet potato in baked goods, you do need to be cautious about recipes that include baking soda. Combining the two ingredients may turn the potato’s flesh green.

What Does It Taste Like?

Purple sweet potatoes have a rich, almost winey flavor with a creamy texture. They are denser and drier than regular sweet potatoes, which is why moist cooking methods and longer times are recommended.

Purple Sweet Potato Recipes

While you may be hard-pressed to find recipes that specifically call for purple sweet potatoes, they can work in nearly any recipe that uses regular sweet potatoes. Just keep in mind the extended cooking time when using them as a substitute.

Where to Buy Purple Sweet Potatoes

Okinawan sweet potatoes enjoy a year-round season while the Stokes Purple variety is typically available from September through June. Like other sweet potatoes, the peak season for the purple varieties is during the fall and winter months. They may not be available in every grocery store, depending on where you live. You’ll have the best luck at specialty markets, including those that cater to Asian foods. Like other potatoes, they are sold by the pound, either loose or weighed out in bags (3 pounds is common). You can also buy them in larger bulk quantities at some stores or online. You can grow purple sweet potatoes at home, though the availability of the slips or shoots for planting is limited and not always easy to find. The Okinawan variety needs a similar climate to Okinawa, such as Hawaii, while Stokes Purple is a better choice for home gardens on the U.S. mainland.

Look for purple sweet potatoes that are firm. Avoid any with soft or brown spots, sprouts, or wrinkled skin.

Storage

Sweet potatoes, in general, do not store as well as regular potatoes. Avoid bruising these potatoes as the slightest damage can cause the entire sweet potato to go bad. You can keep them at room temperature for about a week. For longer storage, keep them in a dry, dark, and cool place with good ventilation and use within a few weeks. Storing any sweet potato in the refrigerator can throw off the flavor and lead to a very hard center.

Cooked sweet potatoes can be stored in an airtight container for a week. Like other sweet potatoes, you can also freeze them after cooking, whether whole and baked or as a casserole.

SOURCE: TheSpruceEats Darlene Schmidt