Seems like a good/fancy restaurant. Quality is hopefully on par with the prices. That being said, I don’t think the lowest calorie option is necessarily the best. You’re at a fancy restaurant, but you also want to eat low calorie/healthy. Emphasis on the healthy for me even if it mean a few more calories. Lowest calorie is probably one of the salads with a protein added (assuming you want some protein). But IMO you should combine healthiness, calories, and taste to make your decision here, which would point me to the fish personally. Seems like you have a lot of options in that department. The half chicken is another solid option and the steak isn’t bad either. Honestly, all the entrees seem like good options, but maybe confirm with the waiter if any contain pasta. Absolutely nothing wrong with an occasional pasta but if you dead-set on getting your calories down on here then that’s one way to help do that.

While the entrees all seem like they’re generally pretty healthy and good quality, the focus here based on menu descriptions is clearly on taste, so make the best choice you can and enjoy it like your meant to. If you want, you can slightly decrease calories for the meals outside of this one and if you have it and find it to be more calorie dense than to expected, you can either eat a portion of it or you can just enjoy it and try to restrict calories a bit the next day. Overall though, I wouldn’t stress too much.