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Lentil Stew with Purple Sweet Potatoes (Beni Imo)

Lentils and Beni imo (purple sweet potatoes)
A delicious Lentil Stew with Purple Sweet Potatoes (Beni Imo), inspired by the wholesome, plant-focused eating habits characteristic of Blue Zone diets.
5.0 from 1 vote

Let’s dive into crafting a delicious Lentil Stew with Purple Sweet Potatoes (Beni Imo), drawing inspiration from the wholesome, plant-focused eating habits characteristic of Blue Zone diets. This stew celebrates simple, nutritious ingredients brought together in a heartwarming meal.

Heap of Lentils
Heap of Lentils

Why Are Lentils Nutritious?

Lentils are a staple in the diets of many Blue Zones. They are incredibly nutritious and a critical player in maintaining a healthy lifestyle. They’re a fantastic source of plant-based protein, making them an essential ingredient for those aiming to reduce meat consumption. With about 18 grams of protein per cooked cup, they help in muscle repair and growth.

Lentils are also rich in dietary fiber, providing about 15 grams per cup. Fiber aids in digestion and helps maintain steady blood sugar levels. This is crucial for preventing spikes and crashes in blood sugar, thereby reducing the risk of diabetes. Plus, lentils are packed with iron, which is vital for energy and metabolism, and folate, essential for DNA synthesis and repair.

This combination of nutrients makes Lentils an excellent choice for anyone looking to enhance their diet with foods that support long-term health and vitality.

Are Purple Sweet Potatoes a Blue Zone Food?

Sweet potatoes, particularly the purple variety—known as “beni imo” in Okinawa—hold a special place in Blue Zone diets. Okinawans, renowned for their longevity, consume sweet potatoes as a primary carbohydrate source. These vibrant tubers are rich in beta-carotene, vitamin C, and potassium, contributing to heart health, immune function, and skin vitality.

Additionally, the high fiber content also plays a role in maintaining a healthy gut and prolonging satiety, which can aid in weight management. Their versatility and nutritional profile make purple sweet potatoes a valued component of a longevity-supporting diet.

Beni Imo purple sweet potatoes
Beni Imo purple Sweet Potatoes on Kitchen Counter

Why Are Purple Sweet Potatoes Special?

Purple sweet potatoes, or beni imo, are not just visually striking; they’re also nutritional gems. Their vivid purple hue comes from anthocyanins. These are potent antioxidants that have been linked to a reduced risk of heart disease and improved eye health. Plus, studies suggest that these antioxidants can also protect against certain types of cancer and improve brain function.

In addition to their antioxidant properties, purple sweet potatoes offer a unique sweet and earthy flavor. They can enrich dishes with both taste and nutritional benefits! Their rarity outside Okinawa adds an exotic touch to meals, inviting a piece of Blue Zone wellness into homes worldwide.

Lentils and Beni Imo Purple Sweet Potatoes Cooking
Lentils and Beni Imo Cooking on Stove

What Should I Use if I Can’t Find Purple Sweet Potatoes Near Me?

If purple sweet potatoes are elusive in your local market, regular sweet potatoes are an excellent alternative. While they lack the anthocyanins found in their purple counterparts, orange sweet potatoes are still incredibly nutritious, offering high levels of beta-carotene, vitamins, and fiber. They can seamlessly substitute purple sweet potatoes in recipes, ensuring you still reap the benefits of a nutrient-dense, Blue Zone-inspired meal.

The key here is to embrace the spirit of Blue Zone eating by choosing whole, nutrient-packed ingredients, regardless of the specific variety.

Lentil Stew with Purple Sweet Potatoes (Beni Imo)

Recipe by Nate Clark
5.0 from 1 vote
Course: DinnerCuisine: Blue ZoneDifficulty: Easy


Prep time


Cooking time





Enjoy this nourishing Lentil Stew with magical Purple Sweet Potatoes, a dish that marries the healthful legacies of Blue Zone regions with the ease and simplicity you need to survive today’s busy world.

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  • 1 Tbsp olive oil

  • 1 onion, chopped

  • 2 cloves garlic, minced

  • 1 Tbsp ginger, grated

  • 1 cup dried lentils, rinsed

  • 2 purple sweet potatoes (beni imo), peeled and cubed

  • 4 cups vegetable broth

  • 1 tsp cumin

  • salt and pepper to taste

  • cilantro or parsley (optional)


  • Sauté the Base: In a large pot, heat the olive oil over medium heat. Add the onion, garlic, and ginger, cooking until the onion is translucent.
  • Add Lentils and Potatoes: Stir in the lentils and cubed purple sweet potatoes, mixing to combine.
  • Season and Simmer: Pour in the vegetable broth and bring to a boil. Add cumin, salt, and pepper. Reduce heat, cover, and simmer until the lentils and sweet potatoes are tender, about 30-35 minutes.
  • Garnish and Serve: Once cooked, check for seasoning adjustments, then ladle into bowls. Garnish with fresh cilantro or parsley before serving.


  • If you can’t find beni imo near you, substitute these with regular purple sweet potatoes (orange inside).

Nutrition Facts

  • Total number of serves: 4
  • Calories: 212kcal
  • Carbohydrates: 43.7g
  • Protein: 11.1g
  • Fat: 3.4g
  • Saturated Fat: .5g
  • Polyunsaturated Fat: .4g
  • Monounsaturated Fat: 2.5g
  • Trans Fat: 0g
  • Cholesterol: 0mg
  • Sodium: 781.6mg
  • Potassium: 259mg
  • Fiber: 11.7g
  • Sugar: 6.3g

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Picture of Nate Clark

Nate Clark

Nate Clark has been making content for the Internet since 1921. He's best known as a musical comedian, a fitness enthusiast and author, and as a voice talent for lots of stuff. He's also a filmmaker, and has directed content for brands including Louis Vuitton, FENDI, The New York Times, Breeders' Cup, and many more. He lives in West Hollywood, CA, but he doesn't like visitors.
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A delicious Lentil Stew with Purple Sweet Potatoes (Beni Imo), inspired by the wholesome, plant-focused eating habits characteristic of Blue Zone diets.

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