Personally I think you should order what you really want (within reason of course.) Since this is a lifestyle change, you shouldn't deprive yourself of everything all the time or you just won't be able to stick to something so stringent. You could treat yourself to the main course that you really want but forego on bread, wine and dessert. I would try to avoid anything deep fried like the calamari myself and it's a great idea to choose your dish before you go to the restaurant, log it in your daily food so you avoid making unhealthy snap decisions. And try to eat a light low carb breakfast and lunch. Then tomorrow you could do an extra workout or even better before you go to the restaurant. That's just my opinion and it's worked for me!