From my experience in West Africa the main carb, or food in general, is either rice or some sort of boiled corn. In Southern Uganda it is matoke, a small banana like tuber. It is has more flavor than rice and really fills you up. It can be grilled, boiled, fried…. Eaten with peanut sauce, cooked with meat, served plain, served with rice… It is eaten for breakfast, lunch and dinner. The possibilities are endless. I am currently in the North of the country where there is not matoke and the agriculture and plants are more similar to West Africa but with much more variety in food and easier to farm as there is more rain and 2 harvest seasons in the ‘dry north’. But, as you can see it is plentiful.
Above is a market in the South, close to the trees which are everywhere, meaning matoke is easy to grow. One of those stalks is sold for less than 15,000 shillings here, or about 5 USD.
So from there they are sold to a middle man who brings them to places like Kampala where they are sold for about double the price.
Overall, the produce here is slightly cheaper than in West Africa, especially the bananas and pineapples. One kilo of bananas in Senegal was over a dollar at a banana plantation. Here I got all the fruit featured below for about 3 dollars USD.