You are going to eat out. Pretending otherwise is how plans die. So make it a rule instead of a decision.
The rule
Find the protein first. Pick one carb on purpose. Stop there. That is it, and it works at a steakhouse and at a gas station.
Gas stations
Jerky, tuna packets, hard boiled eggs, a protein shake. Bananas and apples are usually by the register. Skip the roller grill. You already knew that.
Restaurants
Grilled over fried. Ask for the sauce on the side and use half. Order the side you actually want instead of the one that comes with it. Nobody has ever been refused.
Hold the line. One meal does not undo a week.