Vegan Purple Yam Frosting (Ube Macapuno)

Ube:
13.5 ounce can coconut milk
4 ounces purple yam powder
Frosting:
5 tbsp Earth balance shortening
1 cup powdered sugar
1 tbsp soy milk
12 ounce bottle coconut strings (macapuno)

Heat coconut milk in a skillet and mix in purple yam powder. Cook over medium heat for 20 minutes or until thickened.
With a mixer, beat shortening until smooth. Sift in powdered sugar in three portions, mixing between each. While mixing, add soy milk and beat until fluffy. Mix in ube until incorporated and stir in macapuno.