Ingredients :

    3/4 cup purple yam powder
    1-1/2 cups milk
    1/2 cup sugar
    1 egg, beaten
    1 tsp. unsalted butter

Cooking Procedures :

1. Place yam powder and milk in a saucepan; mix thoroughly. Add sugar, egg and butter; simmer over low heat for about 1 hour. Stir constantly using a wooden spoon until the mixture thickens and becomes elastic.
2. Transfer the mixture into a lightly greased containers with lid; let cool to room temperature. Do not cover while still hot.
3. When cooled, cover and chill in the refrigerator for about 3 hours; serve chilled in individual bowls.
4. Serves 4 to 6.