Tenom Mee is a Sabah thing, specifically from the town of Tenom in the interior. If you've never been to Sabah, think of it as that region's answer to wantan mee: springy fresh egg noodles (sang mee) served dry tossed in a pork lard and soy-based sauce, topped with char siew and a handful of blanched veg. It's non-halal. The dry version sits at around 670 calories for a standard bowl, and honestly that's reasonable for what you're getting, but be clear about what's pushing the number up. The pork lard toss and sauce alone is about 175 calories in a small 25g portion. Add in 80g of char siew at 200 calories and you've already spent 375 cal on the fat and protein before the noodles even show up. These are estimates, bah, because proper nutrition lab data for Tenom Mee basically doesn't exist anywhere. Take the numbers as a solid ballpark, not gospel.
The soup version drops to around 480 calories because you swap the lard toss for a lighter clear pork broth, so that's your easiest win if you're watching calories. The noodle portion itself is the other big lever: 170g of fresh egg noodles is 280 calories, and hawker bowls can easily go heavier than that. If you pile on roasted pork belly and Hakka egg rolls on top of your char siew, you're looking at closer to 820 calories for the mixed toppings version. The veg (choy sum, blanched) is basically free at 15 calories for 60g, so don't skip it. Order extra vegetables if you can, it adds volume without touching the total much.