sorry i find this post funny because i have the opposite issue, id like to shed a few pounds :) I know though a lot of people out there have a hard time gaining weight. The important thing is to gain in a healthy way and not consume large amounts of foods that are unhealthy for you like fast foods and extra sugars etc. While doing all the gaining don't forget to keep the exercise up to maintain the health of your heart and keep your muscles toned:) Good luck:)

ghee, lots and lots of ghee (clarified butter)

I find switching from four small meals a day to two big meals a day always helps me gain a bit of weight.

If I were you I'd start eating a few more potatoes...carbs are a good way of increasing body mass.