Cooking Floyd: I Need A Gyro

We like gyro sandwiches: spicy seasoned ground lamb strips, fresh onions, tomatoes and lettuce, tangy tzatziki sauce, all piled on a soft pillowy pita.   Unfortunately what we mostly get is greasy mystery meat, wilted veggies, some kind of runny white liquid on a dried out flatbread that cracks into pieces when you pick it up.  So I've been on a quest for a few years to make what we know a gyro can be at home.  I think I finally did it!