Here is the recipe I used:
Ube-Macapuno Cake
Ingredients
2 1/2 cups cake flour
3 teaspoons baking powder
1 teaspoon salt
1 cup ube (purple yam), cooked and
finely grated
3/4 cup milk
1 teaspoon vanilla extract
1/2 cup corn syrup
7 egg yolks, lightly beaten
1/2 cup vegetable oil
7 egg whites
1 teaspoon cream of tartar
1 cup white sugar
purple food gel
Directions
- Preheat oven to 325 degrees F. Mix together the flour, baking powder, and salt; set aside.
- Place grated ube in a large bowl. Mix together the milk and vanilla; gradually blend into ube until smooth. Blend in corn syrup, egg yolks, and oil. Beat in flour mixture until smooth; set aside.
- In a large glass or metal mixing bowl, beat egg whites with cream of tartar until foamy. Gradually add sugar, then red and blue food coloring, continuing to beat until stiff peaks form. Fold 1/3 of the whites into the batter, then quickly fold in remaining whites until no streaks remain. Pour batter into prepared pans.
- Bake in the preheated oven for 30 to 35 minutes, or until the center of cake bounces back when lightly tapped.