Add the potatoes and a pinch of salt to the pan and cook for a few minutes. Be sure to turn frequently so they don't burn.
Add the frozen vegetables, cover and simmer on low heat for one hour. You don't need to add water if using frozen veggies but you may need to add a little water to fresh vegetables.
Check and when the potatoes are done, the rest of the vegetables are done too.
Using a potato masher, mash all the ingredients until smooth.
Taste and adjust seasoning with salt and pepper.
Notes
Serve as a side dish with beef, chicken, lamb or even goat, a popular meat in Kenya according to Sue.