Salads with chicken breast, steak, or fish are good to avoid carbs. Each of these proteins is also good as a food source. You can avoid simple carbs by asking to substitute extra veggies for the carbs i.e., instead of rice or potatoes.

Subway will make salads instead of sandwiches, I believe, avoiding the bread component.

Breakfasts can be a pain, as it is not always easy to avoid carbs or greasy food. Egg beaters/egg whites are a good breakfast food, high in protein, no carbs, and relatively low in fat if cooked right.

You can get some more ideas from books like the South Beach Diet, which has low carb suggestions. Look up recommendations on more slowly digestible carbs like oatmeal, etc.