First peel ur yam and put it in a pot then add water to cover the surface of the yam and add pinch of salt to taste, then put on stove to boil untill well cooked

For the stew,grind the fresh tomatoes together with the pepper in a blender,then transfer it into a sauce pan cook for some minutes then add oil and continue frying, slice ur onions together with the spring onions,wash and add to the stew,add ur desired seasonings and continue frying to the point u want it to be.serve and enjoy