Bake the sweet potatoes, either in the oven for about 30-40 minutes or in the microwave for 8-10 minutes (timings depend on size of sweet potatoes). Once cooked until soft, scoop out the flesh and mash until smooth.
500 grams plain (all purpose) flour, 7 grams sachet Fast Action Yeast, ½ teaspoon salt, ½ teaspoon freshly ground pepper, 350 millilitres warm water
Combine the sweet potatoes with the other ingredients and enough warm water to make a very soft, wet dough. Using one hand, bring all the ingredients together and mix thoroughly for 5-10 minutes or until dough becomes elastic.
Cover dough loosely with cling film and leave in a warm place for 30 minutes.
Divide the mixture into 4 equal portions. Oil your hands, so they don't stick to the dough, shape into flattened rounds and set aside to prove for another 30 minutes, covered with a damp towel.
Melt a little butter in a small, high sided pan (or whatever kind of pan you have) and cook each round over a low heat for 8-10 minutes on each side until browned and cooked through.
Repeat process with remaining bread, keeping the cooked Bola soft by covering with a clean tea towel on a cooling rack.