Tuna is the bomb for cutting, although you'll notice very quickly that you'll be quite hungry within an hour of having a can. Mix it with a tablespoon of flaxseed oil (or Udo's oil, if it's available) and salad and tomatoes (if you're not too anal about carbs). Depending on what type of tuna you use, how many vegetables, etc., this should be a 300-350kcal meal.
Another combo you might want to try is raw chopped spinach and grilled chicken breast. Low in fat, high in protein, but beware the spinach: although it's high in fiber it WILL cause constipation because of the iron if you don't limit your intake.
Also don't forget to eat legumes around 3 times a week if you're not limiting carb intake too much.
I found that when cutting, it's best to avoid grains and starchy and simple carbohydrates. Carbohydrates obtained from vegetables and legumes shouldn't be avoided too much if you care for your health.
Stay away from red meat when cutting, though, as even "extra super lean" meat is too high in saturated fats to be considered a healthy source of protein.
Also, you may want to have egg white omelettes with "Yves Veggie Dogs" if you're getting bored of just eating meat. Very high in protein and low in carbs.