There is one right at the exit to the Treehouse in Adventureland. It is open sporadically though. They also have samosas which we love. My favorite tip: go to the Tomorrowland Noodle Station and get a small condiment cup filled with the hot sauce and take it with you to get your egg rolls or samosas.
A samosa (samosas is plural) is an Indian curry-filled deep-fried turnover. Often, they have potatoes and peas and such in it, but the ones at MK just say "vegetable curry". I haven't tried them at WDW, but I love to order them in Indian restaurants. Very tasty!