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Njahi

Black beans mashed with banana

Njahi: Kikuyu black lablab beans slow-cooked and mashed with ripe banana

Kikuyu families in Kiambu, Murang'a and Nyeri cook a big pot of njahi for a woman who has just given birth, and visitors bring the beans as a gift; the dish is said to build strength and milk. The beans are small, glossy black lablab beans, simmered for a long time until creamy, then mashed with ripe bananas so the result is dark, soft and gently sweet against the savoury onion and tomato. Look for dried njahi at African grocers (sometimes labelled black dolichos or black lablab beans); black turtle beans are the closest swap and cook a little faster, but skipping the overnight soak is the classic error with either: unsoaked beans stay chalky even after hours. Eat it warm with a cup of tea, or as a main with greens. Chef's tip: choose bananas with brown freckles but still firm; overripe black ones make the mash taste like dessert.

Prep
15 min
Cook
135 min
Difficulty
Medium
Serves
6
Per serving
360 kcal
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Ingredients

Serves6

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Method

0/8 done
  1. Step 1: Drain the soaked 14 oz dried njahi (black lablab beans), rinse them and put them in a large pot with 8 ¼ cups water. Bring to a rolling boil over a high heat and boil hard for 10 minutes.

    10 min
  2. Step 2: Lower the heat, half-cover and simmer, topping up with hot water so the beans stay covered, until they are completely soft and creamy inside when you squash one. Njahi take about 1 hour 45 minutes; black turtle beans about 1 hour 15 minutes.

    105 min
  3. Step 3: Drain the beans, keeping about 250 ml of the cooking liquid.

  4. Step 4: In a wide pan, heat 3 tbsp vegetable oil over a medium heat and fry 2 onions until deep golden, stirring often.

    8 min
  5. Step 5: Add 3 cloves garlic and stir for 1 minute, then add 3 tomatoes and cook until they collapse into a thick sauce.

    6 min
  6. Step 6: Add 3 ripe bananas and stir for 2–3 minutes, until they start to soften and smell sweet.

    3 min
  7. Step 7: Tip in the beans and 1 ½ tsp salt with a splash of the cooking liquid. Mash with a potato masher or a sturdy wooden spoon over a low heat until mostly smooth with some beans left whole, adding more liquid until it is soft and spoonable.

    5 min
  8. Step 8: Taste for salt, stir in 1 handful fresh coriander (dhania) and serve warm. It keeps 4 days in the fridge and reheats well with a splash of water.

Nutrition per serving

Calories
360 kcal
Protein
17 g
Carbs
58 g
Fat
8 g
Fibre
15 g

Nutrition values are estimates.

K
Recipe by

KrazyBadal

All recipes by this chef →

Good to know

How long does njahi take?
About 150 minutes in total: 15 minutes to prepare and 135 minutes to cook.
How many people does it serve?
6 as written. Change the servings above the ingredients and every amount scales to match.
Is it vegan?
Yes. It has no meat, fish, dairy or eggs.
Is it gluten free?
Yes, as written. Check the labels on stock, sauces and spice mixes, which sometimes contain gluten.
Can I make it ahead?
Yes. It keeps well, so you can cook it earlier in the day or the day before and reheat it.
What can I use instead of onions?
2 shallots per onion.
What can I use instead of garlic?
½ tsp garlic paste or ⅛ tsp garlic powder per clove.

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