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Onn Vegetarian
5 Upper Boon Keng Rd, #01-01, Singapore 380005
Onn Vegetarian serves vegetarian cuisine in Kallang at 5 Upper Boon Keng Rd. With a 4.7 rating across 82 reviews, the restaurant draws visitors seeking meat-free dining options in the neighbourhood.
Opening Hours
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STAMPEDE Score
Moderate confidenceScore: 90 / 100
Based on 4 data points · Updated 1 month ago
Editor’s Note
Last updated 3 Aug 2026
Our take: Onn Vegetarian offers a compelling vegetarian and vegan-friendly Chinese/Asian menu in a coffeeshop setting, distinguishing itself with dishes that reviewers describe as restaurant-quality.
The absence of alliums makes it suitable for a wider range of dietary preferences.
We note consistent praise for the flavour and quality, with the $6 vegetarian Char Siew Wanton Noodle frequently highlighted as a standout.
Other dishes like the bitter gourd 'fish' slice and Assam 'fish' are also well-received for their texture and balanced flavours.
While the spinach with mushrooms is deemed good, it's acknowledged as a more standard zi char offering.
We observe that the establishment is popular with locals, often leading to significant wait times of 20-30 minutes, even before the main lunch crowd.
This popularity also means items can sell out quickly, suggesting an early visit is advisable.
The friendly service, with staff bringing food to tables and owners explaining dishes, adds to the positive experience.
We'd recommend Onn Vegetarian for those seeking flavourful, plant-based Chinese cuisine, provided you're prepared for a potential wait or plan to visit outside of peak hours.
Signature
vegetarian Char Siew Wanton Noodle
Best time
early, before lunch rush
Wait time
20-30 minutes during peak hours
Price
$$ ($10-15/person)
Score: 90 · 4 sources
What customers say
Onn Vegetarian is highly praised for its delicious, fully plant-based Chinese/Asian cuisine, with many customers highlighting dishes like the vegetarian Char Siew Wanton Noodle, Bak Kut Teh, bitter gourd fish slice, and Assam fish.
Patrons consistently commend the restaurant-quality food served in a coffeeshop setting and the friendly, helpful owner who provides excellent service and recommendations.
While the food is celebrated for its flavour and quality, a recurring point is the long waiting times, especially before lunchtime.
Google Reviews
Soup Noodles, Bak Kut Teh with Rice, Bok Choy and vegetarian Char siew with Onn Vegetarian’s special sauce 😱🤯 Restaurant standard in a coffeeshop. Never seen before. All dishes served by Onn Vegeta…
Serves delicious vegan-friendly Chinese/Asian food without alliums. I tried the vegetarian Char Siew Wanton Noodle ($6) and it was really flavourful and satisfying, definitely worth the $6 for the qua…
ordered 3 dishes all very nice. $34 total with 3 brown rice. favourite was bitter gourd fish slice, the fish slice texture very good. next is Assam fish, the sourness and spicy is just nice. the sp…
We found this place through some research, and it was perfectly located on our way into the city. It’s clearly popular with locals, which is always a great sign. Everything on the menu is fully plant…
Reviews from Google
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