Ugandan Sweet Potato and Groundnut Stew

the sustaining stew of Uganda and the Great Lakes: orange-fleshed sweet potato simmered in a spiced tomato and onion base enriched with groundnut paste until the tuber is yielding and the sauce is thick and deeply savoury — served over millet or sorghum porridge, maize bread, or plain rice

Origin: Uganda and the Great Lakes Region, East Africa

From the journey of Sweet Potato.

Uganda records among the highest per-capita sweet potato consumption on earth, and the Great Lakes region of East Africa has developed one of the most sophisticated culinary relationships with Ipomoea batatas outside its original American homeland. The sweet potato reached the region through a combination of pathways: overland diffusion from the West African coast, Indian Ocean trade networks, and colonial-era planting programmes, but it was adopted so thoroughly and so long ago that it is now experienced as entirely indigenous by the communities that grow and cook it. In Uganda, the sweet potato is cultivated predominantly by women farmers on smallholder plots, and it serves multiple roles in the household food system: the leaves are cooked as relish, the vines feed livestock, and the tuber is eaten boiled, roasted, fried, and, most importantly, as a stew. The sweet potato stew tradition of the Great Lakes region combines the tuber with the groundnut paste (ebinyebwa in Luganda, peanut butter in its simplest form) that is one of the foundational ingredients of East and Central African cooking, producing a dish that is simultaneously sweet, savoury, rich, and sustaining. The orange-fleshed sweet potato, introduced through public health programmes from the 1990s onwards by HarvestPlus and the International Potato Center, has added a dimension to this tradition that its originators did not anticipate: the vivid orange colour has made the vitamin A-rich varieties visibly distinct and has become in some communities a marker of nutritional awareness that has shifted consumer preference away from the white-fleshed varieties previously dominant.

Ingredients

Stew

2 tbsp groundnut oil or sunflower oil
1 large onion, finely chopped
3 garlic cloves, finely chopped
1 thumb fresh ginger, peeled and grated
1 fresh red chilli, thinly sliced, or 0.5 tsp chilli flakes
400 g tinned chopped tomatoes
1 tsp ground coriander
0.5 tsp ground turmeric
700 g orange-fleshed sweet potatoes, peeled and cut into 3–4 cm chunks
100 g smooth unsweetened peanut butter (ebinyebwa / groundnut paste)
500 ml vegetable or chicken stock
1 tsp fine salt, plus more to taste
100 g baby spinach or sweet potato leaves, roughly chopped
1 tbsp lemon juice

To Serve

2 tbsp fresh coriander, roughly chopped, to garnish

Method

Heat the oil in a large, heavy-based saucepan over medium heat. Add the onion and cook, stirring, for 8–10 minutes until soft and lightly golden. Add the garlic, ginger, and chilli and cook for a further 2 minutes.
Add the ground coriander and turmeric; stir to coat the onion mixture. Add the chopped tomatoes and cook over medium-high heat, stirring occasionally, for 8–10 minutes until the tomatoes have broken down and the sauce has thickened and darkened.
In a small bowl, whisk the peanut butter with about 100 ml of the stock until smooth. Add this paste to the tomato mixture and stir to combine. Gradually add the remaining stock, stirring to produce a smooth, lightly thickened sauce.
Add the sweet potato chunks and the salt. Bring to a simmer, cover loosely, and cook over medium-low heat for 20–25 minutes until the sweet potato is completely tender and the sauce has thickened to a rich, coating consistency. Stir gently every 5–6 minutes to prevent the bottom from catching.
Add the spinach or sweet potato leaves and stir through. Cook for 2 minutes until wilted. Add the lemon juice, taste, and adjust the salt. Serve over millet or sorghum porridge, maize bread, or plain steamed rice, garnished with the fresh coriander.

Notes

Orange-fleshed sweet potato is preferred both for its beta-carotene content and for the vivid colour it gives the finished stew; white-fleshed varieties produce a duller, less attractive result. Sweet potato leaves, when available, can be used instead of spinach and are closer to the authentic East African preparation; they are available from some African grocery shops. The stew keeps well refrigerated for 3 days and improves overnight as the groundnut sauce thickens further; add a splash of water or stock when reheating. Traditionally served with posho (maize meal porridge, the Ugandan equivalent of sadza or ugali) or with steamed green bananas (matooke).

The Gastrographer

Name: Ugandan Sweet Potato and Groundnut Stew
Prep time: 15 min
Cook time: 40 min
Total time: 55 min
Yield: 4
Cuisine: East Africa
Ingredients: 2 tbsp groundnut oil or sunflower oil; 1 large onion, finely chopped; 3 garlic cloves, finely chopped; 1 thumb fresh ginger, peeled and grated; 1 fresh red chilli, thinly sliced, or 0.5 tsp chilli flakes; 400 g tinned chopped tomatoes; 1 tsp ground coriander; 0.5 tsp ground turmeric; 700 g orange-fleshed sweet potatoes, peeled and cut into 3–4 cm chunks; 100 g smooth unsweetened peanut butter (ebinyebwa / groundnut paste); 500 ml vegetable or chicken stock; 1 tsp fine salt, plus more to taste; 100 g baby spinach or sweet potato leaves, roughly chopped; 1 tbsp lemon juice; 2 tbsp fresh coriander, roughly chopped, to garnish

Mapping Culinary History

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Journey Point Map Key

Ingredient originTrade or transit route

Became a culinary stapleColonial / trade control