If you're away from home and are eating in restaurants for 3 meals a day, sometimes it's hard to figure out what to do.
A sort of easy way to do this is to just order whatever you ordinarily order, and a to go box at the same time you place your order and make sure the waiter knows you want it delivered at the same time as your meal. Then when the meal arrives, put half of your order into the box and set it aside. Instant portion control. You get to enjoy a meal just like everyone else.
Alternatively, for a lunch or dinner... a salad, veggies, fish or chicken without sauce works great.
Since most of us can't avoid restaurants until we are at goal, these may help your process.