Step 1

In a mixing bowl, combine eggs and butter. Break the eggyolks and whisk until well-combined.

Step 2

Add ube condensed milk and vanilla extract. Mix until well-combined.

Step 3

Sift the all purpose flour, baking powder and salt. Sift to remove the lumps. Add to the egg and milk mixture. Mix until the batter becomes smooth and well-combined.

Step 4

Put baking paper at the bottom of the baking pan. Pour the cake mixture. Tap against the table to remove bubbles. Cover the baking pan with aluminum foil (this will prevent the steaming water from dripping to the cake).

Step 5

Arrange in a steamer. Make sure that the water in the steamer is already boiling before putting the cake. Steam for 45 minutes (depending on the thickness of the mixture) or until toothpick comes out clean.

Step 6

Once cooked, remove from the steamer and let it cool a little before unmolding. Overturn in a plate or cooling rack to remove the baking paper and let it cool completely. Frost however you like.

Step 7

In a pan, break the eggyolks. Then add ube condensed milk. Dissolve the cornstarch in evaporated milk. Make sure that there's no lumps. Once dissolved, add to the condensed mixture in the pan.

Step 8

Put the mixture over the heat and cook in low heat while continuously stirring. Cook until it boils a little and starts to thicken up. Do not leave it while cooking as it might burn easily. Keep stirring until the mixture becomes sticky.

Step 9

After around 10 minutes, the mixture should start thickening up. Use rubber or silicone spatula to stir and scrape the sides and bottom. The consistency should be somewhat sticky (almost like pudding) and thick. Continue cooking for few more minutes until you get the right consistency for the frosting.

Step 10

When it's about to get cooked, add the vanilla extract and salt (to balance the sweetness). Stir until well-blended.

Step 11

Once you get the right consistency, remove from heat and let it cool completely before frosting the cake. If you want to make it more stable, chill for at least 2 hours before frosting.