Easy and Fast Greek Gyros

I made this last night and it was delicious, healthy and easy.

Serves 4

Ingredients
FOR THE GYRO FILLING:
1 tablespoon Olive Oil
½ pounds Sliced Deli Roast Beef (cut in strips)
6 drops Worcestershire Sauce
4 dashes Lemon Pepper
2 dashes Paprika
2 teaspoons Garlic Powder, Divided
6 dashes Black Pepper
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FOR THE TZATZIKI SAUCE:
2 whole Cucumber, Divided Use *one was plenty
2 containers 8oz Greek Yogurt *12 oz was plenty
1 whole Red Onion, Divided Use *1/2 was plenty
4 dashes White Wine Vinegar
1 teaspoon Dill
1 teaspoon Salt
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FOR ASSEMBLY:
4 slices Naan Bread Or Any Flatbread
2 whole Tomato, Sliced
¼ pounds Feta Cheese, Diced
¾ pounds Canned Black Olives Sliced *didn't add
*I added spinach

Preparation Instructions
For gyro filling:
Heat olive oil in a skillet and add beef, worcestershire sauce, a dash of lemon pepper, paprika, 1/2 teaspoon of garlic powder, black pepper, and heat the beef. Let it sit on low heat while tzatziki sauce is prepared.
For Tzatziki sauce:
Finely dice half of the cucumber and combine with yogurt, 1/4 of the red onion finely diced, vinegar, and all remaining seasonings.
Spray your flatbread with cooking spray and put it under the broiler until it is soft and warmed through. Fill it with a generous amount of roast beef, followed by lots of tzatziki sauce, feta cheese, tomato, cucumber, and black olives.