By Lawrence Davis
Bangkok’s Sweet Escape
In Bangkok’s relentless heat, few desserts hit the spot like tub tim grob (ทับทิมกรอบ), affectionately called “red rubies.” The dish is a refreshing mix of crunchy water chestnuts coated in red-tinted tapioca flour, floating in a bowl of sweetened coconut milk, often finished with shaved ice. For Bangkokians, it’s not just a dessert — it’s a cooling ritual.
The Magic in the Crunch
What sets tub tim grob apart is the contrast of textures. Each ruby bursts with crunch before giving way to the chewiness of its coating, all balanced by the rich creaminess of coconut milk. The crushed ice makes it especially satisfying in Bangkok’s humid climate, making it one of the most beloved Thai desserts.
Old and New Spots to Try It
Traditional dessert shops in areas like Banglamphu still serve the classic version, while Chinatown’s street stalls are known for tubs of glowing red rubies ready to be scooped into bowls. In 2025, modern dessert cafés have updated the dish with twists like pandan-flavored syrup, exotic fruits, or layered parfait-style presentations.
A Dessert That Lasts
Despite these reinventions, the heart of tub tim grob remains the same — a simple, refreshing bowl of sweetness that cools the body and comforts the spirit. It’s proof that sometimes the best Bangkok treats don’t need to be complicated.
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Lawrence Davis is a Bangkok-based lifestyle writer.