I think Gyuveche would be the main comfort food of Bulgaria, its like a casserole, layers of various vegetables, meat, and cheese. But its cooked in the oven in an earthware pot called a gyuveche. I had it when I traveled through Bulgaria and it was one of the most amazing things I've ever tasted! I found some recipies and tried to replicate, it was good but nowhere near as good as in Bulgaria. (hint: mixing some ranch dressing after its cooked made mine taste a lot better). So do a search for Gyuveche and give that a try.