230 calories for 4 pieces of Tauhu Sumbat is honestly pretty decent. For a hawker snack, that's on the lighter side. The filling itself, cucumber and beansprouts, is basically zero calories, so you're not getting cheated there. The calories are coming from the tau pok (fried tofu puffs), which soak up oil during frying. 165 calories from just the tofu alone. That's worth knowing. The sweet chilli sauce adds 45 more, which is fine, but if your uncle at the stall goes heavy-handed with it, that number creeps up. Fair warning though, these numbers are a ballpark estimate because hard data on homemade hawker Tauhu Sumbat is thin. Different stalls fry their tau pok differently, some soak in a lot more oil than others, so treat 230 as a reasonable middle-ground figure, not a lab result.
What actually moves the maths here is the sauce choice. Swap sweet chilli for peanut sauce and you're jumping to about 290 calories, that extra 60 calories from peanut sauce adds up if you're having this as a side to a full meal. The tofu itself isn't going anywhere calorie-wise unless you eat fewer pieces, but if you're at a stall where they're selling yong tau foo style, you can mix in more filling-heavy pieces to stretch the volume. Protein is 12g for 4 pieces which is reasonable given the tofu. If you want more protein overall, just add a plain hard-boiled egg on the side instead, cheaper and more protein for fewer calories than a second serving of tau pok. For a snack that feels substantial and hits 230 calories with 12g protein, this is actually one of the smarter things you can grab at a hawker stall.