In a pan with ube powder, pour water, stir, and bring to a boil at 248°F (120°C) to rehydrate the powder.
Boil for 30 seconds while constantly stirring then lower the heat to 140°F (60°C) and simmer for 20 to 25 minutes while regularly stirring.
Pour the milk and add the sugar, then stir to dissolve the sugar and thoroughly mix the milk with the hydrated ube powder. Continue to simmer over low heat and regularly stirring while scraping all the sides. The ube mixture will start to thicken after regularly stirring for 15 minutes.
Once the ube mixture starts to thicken, stir continuously over low heat for another 15 to 20 minutes, until the ube mixture is smooth, dense, thick, and no longer sticking to the pan.
If using, add softened butter and combine well with the ube halaya, then continue stirring for 3 to 5 minutes.
Turn off the stove and transfer the homemade ube halaya to a serving bowl.
Notes
Use 100% purple yam powder. Purple yam powder works differently and stay clear from ube powder specially made for ube fillings.Use a light and sturdy wooden spoon with a thick handle. This will help as the ube mixture starts to thicken and is heavy to stir.Once the ube mixture with milk and sugar starts to thicken after regularly stirring, do not stop stirring at this point. If available, have someone else to alternately stir the ube mixture continuously. If only one person is stirring, make sure the individual doesn’t have any wrist, arm, or shoulder injury.This Ube Halaya recipe is mildly sweet. If sweeter jam is preferred, add 1 to 2 tablespoons at a time before the ube mixture becomes dense.Unsalted butter is optional, but the fragrant butter adds another layer of richness and aroma. The ube powder, milk, and sugar ended up with a shimmering, glossy finish. The addition of butter at the end did not add a glossy finish.In the Philippines, Filipino Ube Halaya is available year-round, but it’s traditionally served during the Yuletide season and given as edible gifts too.In the Philippines, the jam is served as a dessert, a filling to Pandesal for breakfast, and added to beverages too. In recent years, it has been popularly added when making pancakes, breads, and desserts.Completely cool the halaya and transfer to an airtight container if preferred.This recipe makes a little over 1 cup. Makes 8 servings with 2 tablespoons per serving.