Savory Stovetop Beef Shawarma

Ingredients

• 680 grams top sirloin steak, cut into strips against the grain
• 30 milliliters olive oil
• 1/2 teaspoon cumin powder
• 1/2 teaspoon ground coriander
• 1/2 teaspoon paprika
• 1/2 teaspoon turmeric powder
• 1/8 teaspoon cayenne pepper
• 1/4 teaspoon ground black or white pepper
• 1/2 teaspoon salt
• 1 teaspoon beef bouillon powder
• 1/4 medium onion, thinly sliced
• 3 garlic cloves, finely minced
• 15 milliliters freshly squeezed lemon juice
• 4 flour tortillas or pita bread
• 1 head green leaf lettuce
• 1 English cucumber, sliced
• 2 Roma tomatoes, sliced
• 1/2 medium red onion, sliced
• shawarma sauce