In a restaurant or takeaway, the meat for a gyro would be cooked on a vertical rotisserie, like a döner kebab. But you can still make a very convincing version of gyros at home without that. And you must make the tzatziki using the Greek method shown here - it's nothing short of brilliant!
1 large potato and 2 bamboo skewers to assemble the meat stack. Sliced red onion, tomato and shredded lettuce to serve.