Yes, there're no jobs, but you can still earn in excess of Kshs 100K per month from a minimal capital. Think of just delivering food to places of work. A plate that costs Shs 200 bob e.g Ugali beef, the cost of preparing it is about Shs 80 bob. Ensure 100 bob net profit per plate

From millions of people entering your city daily (Nairobi has ~4.5M people) if you can convince only 50 people to eat your healthy food once daily, and each plate gives you 100 bob net, thats almost 150k/month. I believe u can sell more if you serve lunch, tea, dinner if possible