I haven't tried a ton of Greek food, but my friend made these for me once and I loved them!
I view it as the Greek version of the American BLT.
Recipe from Marta Webster
Greek Pita Bread
1 pkg. Gyro meat (looks like bacon)
sliced red onion
roasted red bell peppers
1/2 pint sour cream
1 large garlic clove
salt and pepper
Fry gyro meat (as you would bacon).
Meanwhile, slice up veggies.
Combine sour cream, cucumber and garlic clove in a food processor and pulse until smooth. Season to taste with salt and pepper.
Remove gryo meat and set on paper towels.
For each pita:
Spread small amount of sour cream sauce over half of pita.
Layer meat, lettuce, onion, pepper, tomato and olives.
Fold pita in half.
Dip in remaining sauce, if desired.