If you're looking for foreign food, you should keep in mind some of the limitations of the region. In some cases there are substitutions that may seem a little strange to westerners. In other cases you may find that the ingredients have been imported, and therefore it might cost a little more than it might at home. You will however find many of the chain restaurants that you find all over the world including McDonald's, KFC, and Pizza Hut, just to name a few. The high end hotels in Islamabad also offer many fine dining choices with a fairly good choice in cuisine types. Keep in mind that pork products are illegal in Pakistan, so if you’re craving bacon you will likely have to settle for turkey bacon.
If you're looking for classic Pakistani food you can either look for some of the local shops in the markets, or you can check out one of the two great places to enjoy a meal out in the city. Both Saidpur village and the restaurants in Monal (at the top of the Margalla Hills) offer great environments to enjoy some local food. Personally I feel the local food is a little better in Saidpur village, and it includes great ambiance. Monal on the other hand offers good Pakistani food, and a beautiful view of the city. They also offer a little more western food than in Saidpur village, just in case you have someone that isn't keen on Pakistani food.
As a warning, keep in mind that food hygiene in Pakistan isn't the same as one might find in other countries. So it's important to think about what you're eating all the time. Make sure your water comes in a bottle, make sure your meat is cooked, and for god sake avoid lettuce at all costs. It's also important to note that just because you're paying for an expensive meal, don't assume that you can ignore these issues.
Later