Grilled Gyro Beef

You will need: Lean Beef( Chuck Roast)-1 lb Olive oil-3 tbsp Lemon juice-1 tsp Pepper powder- 1 ½ tbsp Garlic Powder- 1 ½ tbsp or crushed fresh garlic. Dried Oregano- 1 tsp Garam Masala- 1 tsp Sea salt- ½ tsp or to taste Cayenne Pepper-1 tsp( or substitute with ½ tsp Red Pepper fl..