Bring the apple juice or the maple sap to a boil and place ham in it. Cover and simmer over low heat for 3 hours, or until the ham is tender. Remove meat from liquid and trim off the rind only.
Place the sugar, mustard, cloves and water in a saucepan and add one cup of the cooking juice and 2 cups of raisins. Simmer 5 minutes, then place ham in dripping pan and pour sauce over it. Bake at 150ºC , for 30 minutes.
Thicken the juice to taste with browned flour, blended with cold water. Serve the delicious raisin sauce with the warm ham (which is equally good cold).