This is know as  ugali in Kenya and Tanzania.

However, this dish goes by different names in sub-Saharan Africa. In Malawi and Zambia it is called nsima and if you are in South Africa, then ask for pap or mealie pap. Zimbabweans call it sadza.

Since my writing on food as as bland as it can get, I found the best description about Ugali on internet.
Here it goes
"Ugali is usually served as an accompaniment to meat or vegetable stews, greens or soured milk. To eat ugali, pull off a small ball of mush with your fingers. Form an indentation with your thumb, and use it to scoop up accompanying stews and other dishes. Or you can form larger balls with your hands or an ice cream scoop, place them in individual serving bowls and spoon stew around them".
That's it.