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Sweet Beans: All About Adzuki

Hannah (BitterSweet)
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Drawn in by the scent of sweet pancakes sizzling between two iron plates, much like the nostalgic aroma of waffle cones in the ice cream parlors of my youth, I had no idea that this would be my first encounter with adzuki beans. I was in Japan for the first time, bearing more sweet teeth than a shark, and all I knew was that this captivating treat needed to be mine. Emerging from the hot press shaped like a rotund fish, everything about this indescribable flavor was a mystery. It wasn’t until long afterward that I discovered the leguminous truth. Given my impossibly picky nature at that time, it’s probably for the best.

Adzuki beans, often referred to as sweet red beans, aren’t called that for nothing. Though they’re traditionally boiled in a sugar syrup to enhance that aspect, wagashi (Japanese sweets) would be nothing without them. As one of the most ancient of legumes, they’ve played a crucial role in the development of society itself. We’re just so lucky that at this point in history, we can simply indulge in both the sweet and savory results.

A Bean With a Dream: A Brief History of Adzuki

The earliest ancestors of adzuki beans may have originated some 50,000 years ago in the foothills of the Himalayas, though they certainly didn’t look like the legume we know and love today. Domesticated adzuki beans can trace their lineage back over 10,000 years, first cultivated in Japan, eventually taking root across all of East Asia. They were one of the first crops subjected to selective breeding, long before the term GMO was bandied about, naturally favoring longer pods with fewer seeds and more consistent coloring.

Aside from their obvious culinary prowess as a foundational ingredient in macrobiotic cookery and modern pantries, they were revered as having magical powers. In both Korean and Japanese folklore, adzuki beans were believed to ward off evil spirits. Their vibrant red color symbolized protection and vitality. For centuries, they’ve been used not only in celebratory sweets like mochi, yokan, and dorayaki (more on that later), but also in temple offerings and new year dishes. Most notably, sekihan, a sticky rice steamed with adzuki, is a traditional harbinger of good luck.

Their name tells a story of accuracy, if not creativity. “Adzuki” comes from a Romanized spelling of the Japanese “azuki” (小豆), which roughly translates to “small bean.” In Chinese, they’re known as “hong dou” (红豆), AKA “red bean” Then, in Vietnamese, they’re called “đậu đỏ;” you guessed it, “red bean.”

What Do Adzuki Beans Taste Like?

Imagine the nutty, creamy softness of chestnuts, the mild sweetness of cooked oats, and the subtly tannic depth of black tea. Adzuki beans have a gentle, earthy flavor, with a surprising natural sweetness that lends itself to desserts. In fact, it wasn’t until my late teens that I even considered using them in any savory preparations.

Texturally, they’re supple but structured. They hold their shape, when a whole bean is desired, while just as easily blending into a silky-smooth puree. You can often find red bean paste (anko) canned with added sugar, which is either completely smooth or left slightly chunky, for making traditional sweets.

Nutrition For Days

Don’t let their diminutive size fool you; adzuki beans are compact nutritional powerhouses. Exceptionally high in protein and fiber, they’re low fat and high complex carbs, ideal for sustained energy. They’re rich in magnesium, potassium, iron, and zinc, along with proanthocyanidins, which are the same antioxidants found in red wine and berries. Because they’re smaller and less starchy than other beans, many find adzuki easier to digest.

In traditional Chinese medicine, they’re even used as a tonic for the kidneys and bladder, believed to balance yin energy and support circulation.

Macrobiotic principles, which draw from Buddhist philosophy and traditional Eastern medicine, consider adzuki beans to be uniquely balanced. Gentle, grounding, and nourishing, they’re considered the most warming of all beans, and thus, ideal for healing and gaining strength.

Unlike other beans, which can be heavy, gassy, or overly yin (cold and expansive), adzuki are seen as the most energetically balanced legume.

How to Cook Adzuki Beans

Though rarely sold in cans as whole, unsweetened beans, dry adzuki beans are remarkably cooperative. They’re one of the only beans that don’t require pre-soaking no matter the cooking method.

Always start by picking through to remove any stones or shriveled beans. Rinse and drain thoroughly. Use 1 part beans to 4 parts water, and save the salt until after they’re cooked. Macrobiotic cookery suggests adding kombu to the pot, much as you would bay leaves, to improve digestibility, add umami, and minerals like iodine, calcium, and magnesium.

They’re done when soft but not split. Drain well and salt to taste.

How to Use Adzuki Beans

Adzuki beans walk seamlessly between all worlds. Sweet, savory, rustic, refined; there’s a place for them at every table. Given how deeply rooted they are in many time-honored foodways, it’s difficult to compile every possible serving suggestion, or even hone it down to the best hits.

That said, I feel its my duty to at least try.

Japanese Dishes

Chinese Dishes

Vietnamese Dishes

Modern & Fusion Dishes

Adzuki Beans: Past, Present, and Forever

It’s easy to overlook something as small and quiet as an adzuki bean. They’ve been around for thousands of years, unbothered by passing trends. They’ve touched countless lives, found themselves boiled, mashed, candied, fermented, steamed, and simmered, showing up in ceremonial meals and weekday soups. They’ve crossed borders and cultures, changed shape and form, and still managed to stay distinctive, true to form.

In a world where ingredients are constantly being rebranded and revitalized, adzuki beans are steady. They adapt, but they don’t ask for attention. When you cook with them, you’re not just following a recipe. You’re continuing something that began long before you, and will likely continue long after. Everyone should be so fortunate to have adzuki beans in their pantry.

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