sweet potato salad with sugar

Ingredients :

* 500 g (1 lb 2 oz) of sweet potatoes * 1 pinch of salt * 1/2 teaspoonful of pepper

* 1 good pinch of saffron * 1 knob of butter the size of a walnut * 3 soupspoonfuls of groundnut oil

* 1/2 teaspoonful of cinnamon * 1 heaped soupspoonful of sugar

Preparation: 

Peel the sweet potatoes and cut in quarters. Wash and cook with all the ingredients above with the lid on. When the sweet potatoes are cooked, leave to boil down if necessary until a syrupy sauce is produced. Serve hot or cold.