
Shout out to my friends “Chef Ramsey’s Right Hand Pan,” “All Might,” and “Chickpea” for helping me come up with a title!
Names suggested: tarts de la custard ubé, sesame street tarts, ube custard me me tarts, and ube bae bae.
What’s Ube?
If you’re unfamiliar with ube, it’s a yam that’s purple on the inside but a lot sweeter than your average yam! Some people mistake it for taro, but taro, while also delicious, is not a yam to say the least.
Ube is also known for its rich purple color and while taro can also be purple (or white), it’s a lighter shade than ube. Because of it’s intense purple color, ube-flavored foods like breads or lattes are visually captivating.
For example:
Sweet Potato / Ube Latte
A beautiful drink that’ll fill you up and keep you warm ❤
Around 2015 in California, ube sweets were trending in California and prompted many ube-oriented sweets shops to open in LA. Although I live in a suburb of LA, I’ve never had the opportunity to visit one of these stores.
Flash forward five years, and having the time, motivation, and adequate knowledge, I decided to create my own ube treat instead of making the trip to LA (not that I could during the quarantine anyways). I decided on a tart theme.
Initially, I imagined making an ube cheese tart or ube mochi tart. Unfortunately, I didn’t have cream cheese on hand to make a cheese tart and while I was very tempted to make a mochi tart, I wasn’t sure how successful my endeavor would be. Thus, I settled with a custard tart.
No Tart Tin? That’s Okay!
There was one small problem with making tarts — I didn’t have tart tins so I had to use cupcake tins and a 5-inch cookie cutter. You’ll soon see that it turned out to be hardly a problem at all.

I cut some parchment paper rounds to line the bottom of the tins, but I found that it would probably be fine without since there’s so much butter in the dough.
Since I wasn’t too confident in making a tart shell, I did a small batch of tart shells first as a trial run though. For the sake of science, here were the ingredients I used:
Trial 1 – Crust was too thick!

- 5 Tbsp Unsalted Butter
- 1 Large Egg White
- 2 Tbsp Sugar
- 13 Tbsp Flour (or 1/2 Cup + 5 Tbsp)
Crust was too thick at a quarter inch!
The result was a tart that was kind of chewy but also kind of dry. I think it tasted dry because I didn’t roll out the dough as thin as I should’ve. Regardless of the thickness, I felt that this wasn’t the kind of crust that I wanted. I envisioned something more crisp and delicate, not chewy.
After I eating the tarts with the ube custard, I also felt that there was a certain depth missing. I started to think that adding black sesame’s earthy and aromatic flavor profile might help…so I did just that for trial #2.

Except that while I usually have plain black sesame powder on hand, I didn’t this time. I did have instant black sesame powder paste though — the kind that makes instant black sesame dessert soup. I decided to use it anyways because it claimed that it was low sugar anyways, so I took a chance that it would work.
If you use plain black sesame powder (not for instant dessert soup), try substituting with roughly 6 Tbsp black sesame powder and 1 Tbsp sugar.
Anyways, I modified the first tart recipe as follows:
Trial 2 – Winner!
- omit sugar since the instant black sesame powder already has sugar
- add cornstarch for a more delicate pastry
- use less flour to account for flour needed for dusting
- roll out the dough thinner (about an eighth of an inch thick)

I couldn’t be happier with this trial’s results! The pastry was delicate yet crisp, and the black sesame perfectly complemented the ube custard and brought out a “natural” ube flavor.
On another note, I’m so glad that the ube custard set after baking. It was one of my main concerns going into this project but it turned out alright the first time around so I focused on the tart shells instead.

Without further ado, here are the recipes for the ube custard and black sesame tarts:
Ube Custard
Ingredients
- roughly 1 and 1/2 Cups Steamed Ube, mashed
- 1/2 Cup milk
- 2 Tbsp condensed milk
- 1 Tbsp sugar
- 3 egg yolks
Directions
- Combine all the ingredients except the egg yolks in a saucepan. Heat over medium-low heat and stir continuously until the mixture is as smooth as possible. Some small chunks of ube are ok. Turn off the heat and let cool for 10 minutes.
- Transfer the mixture to a blender and blend until completely smooth. Transfer back to the saucepan.
- Beat the 3 egg yolks together in a small bowl. Add two tablespoons of the ube mixture to the eggs and mix to temper them. Add the tempered egg-ube mixture into the pot.
- Whisking continuously over medium-low heat, heat the custard becomes very thick (should be able to hold shape even when it’s hot). Turn off the heat.
- Pass the mixture through a sieve and let it cool. Cover the custard with plastic wrap directly touching the custard. Store in the fridge until needed.
Sesame Tart Dough
Ingredients
- 5 Tbsp Unsalted Butter, room temperature
- 1 Large Egg White
- 2/3 Pack Sesame Powder Paste (Torto brand)*
- 3 Tbsp Cornstarch
- 1/2 Cup + 1 Tbsp Flour
- 1 Tbsp Flour mixed with leftover sesame powder (for dusting)
Directions
- Combine all the ingredients together in a bowl until it becomes a cohesive ball. Roll out dough between two sheets of plastic wrap until it is around a quarter inch thick.
- Chill the dough in the fridge for at least 3 hours. Meanwhile, cut out parchment paper rounds to line the bottoms of the cupcake molds.
- Sprinkle a work surface with a bit of flour and sesame powder and roll out the dough to an eight-inch thickness. Dust the top of the dough with flour/sesame as needed to prevent sticking.
- Use a 5″ cookie cutter to cut out 7 tarts. Place cutouts into the cupcake molds.
- Prick holes at the bottom and sides of the tarts with a fork. Place a small square of parchment paper on top of the the tarts and place pie weights on top. The parchment paper makes it easier to remove pie weights onced baked.
- Blind bake the tarts at 375°F for 7 minutes. Rotate the pan halfway through baking to ensure even baking.
- Take tarts out of the oven and allow tarts to cool for at least 5 minutes. Remove pie weights and parchment paper squares.
Black Sesame Tarts with Ube Custard Filling
Ingredients
- Half of the Ube Custard
- 7 blind-baked Sesame Tarts
Directions
- Fill each tart shell with roughly a tablespoon and a half to 2 tablespoons of ube custard. Smooth out the tops of the custard.
- Bake tarts at 350°F for 20 minutes in the middle-rack of the oven or until the tops of the custard forms a skin. Turn off the oven but let the tarts rest inside for an additional 7-10 minutes or until tart crusts brown to your liking.
- Cool tarts at room temperature for at least 5 minutes before serving.























