🇹🇭 Thailand · Dessert

Tub Tim Krob (Red Rubies Dessert)

30 min
A relaxed effort
🔥 350 kcal
Nicely balanced
🍽 3 servings
Great for the family

By eatmundo · July 9, 2026

Tub Tim Krob (Red Rubies Dessert)🇹🇭 THChensiyuan at English Wikipedia · CC BY-SA 3.0 · Wikimedia Commons

Tub Tim Krob is a delightful Thai dessert known for its vibrant 'red rubies' made from crunchy water chestnuts coated in tapioca flour. These jewel-like pieces are served in a sweet, fragrant coconut milk broth, often with slivers of jackfruit and plenty of crushed ice, creating a refreshing and texturally exciting treat, perfect for cooling down.

Ingredients

How to Make It

  • 1

    Start by preparing the 'rubies'. Dice 200g peeled water chestnuts into small, uniform cubes, about 0.5 cm in size. In a bowl, add 1 tsp red food coloring (or 2 tbsp sala syrup) to the diced water chestnuts and toss well until they are evenly coated in a vibrant red hue. Let them sit for 5-10 minutes to absorb the color.

  • 2

    Drain any excess liquid from the colored water chestnuts. Transfer them to a shallow dish containing 150g tapioca flour. Toss them thoroughly until each red cube is fully coated with a thin layer of flour, resembling little rubies. Ensure they are not clumpy.

  • 3

    Bring a large pot of water to a rolling boil. Carefully drop the coated water chestnuts into the boiling water. Stir gently to prevent sticking. Cook for 2-3 minutes, or until the rubies float to the surface and become translucent with a slightly chewy coating.

  • 4

    Prepare an ice bath in a separate bowl. Once the rubies are cooked, use a slotted spoon to transfer them immediately into the ice bath. This step is crucial to stop the cooking process and maintain their crisp texture. Let them chill for at least 5 minutes, then drain.

  • 5

    Now, prepare the coconut milk broth. In a saucepan, combine 400ml full-fat coconut milk, 50g granulated sugar, and 0.25 tsp salt. If using, add 1 knotted pandan leaf for extra fragrance. Heat over medium-low heat, stirring occasionally, until the sugar dissolves completely and the mixture is warm but not boiling. Remove the pandan leaf.

  • 6

    Let the coconut milk mixture cool down to room temperature, or even better, chill it in the refrigerator for at least 30 minutes for a truly refreshing dessert. The flavors will meld beautifully as it cools.

  • 7

    To assemble your Tub Tim Krob, spoon a generous amount of the chilled coconut milk broth into serving bowls. Add a portion of the glistening red rubies to each bowl. The vibrant contrast is visually appealing.

  • 8

    Finally, add 50g thinly sliced jackfruit (if using) and fill the bowls with plenty of crushed ice. Serve immediately, encouraging guests to mix everything together for a delightful combination of sweet, creamy, and crunchy textures. Enjoy!

Frequently Asked Questions

Why do my water chestnuts lose their crunch after cooking?+

The key is to immediately transfer the cooked rubies into an ice bath. This shocks them, preventing further cooking and preserving their distinct crispness. Overcooking them can also lead to softness.

What is the best substitute for fresh water chestnuts?+

Canned water chestnuts work perfectly well for Tub Tim Krob. Just ensure they are well-drained and patted dry before dicing and coating. Avoid other substitutes as their texture won't be the same.

Can I adjust the sweetness of the coconut milk broth?+

Yes, you can absolutely adjust the sugar content to your preference. Start with the suggested amount and add more gradually, tasting as you go, until you achieve your ideal level of sweetness.

Is pandan leaf essential for the coconut milk?+

While pandan leaf adds a wonderful, subtle aroma that enhances the authentic Thai flavor, it's optional. If you don't have it, the dessert will still be delicious, just without that particular aromatic note.

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