Maple Beef Shawarma

• 450 g (1 lb) Quebec beef sirloin steak
• 1 tbsp olive oil
• 4 pita breads
• 4 leaves romaine lettuce, shredded
• 8 cherry tomatoes, quartered
• 6 Lebanese cucumbers, sliced

For the marinade:

• 2 tbsp olive oil
• 2 tbsp maple syrup
• 2 tbsp maple balsamic vinegar
• 1 tsp ground coriander
• 1 tsp ground cumin
• ½ tsp cinnamon
• 1 clove garlic, minced
• Salt and pepper to taste

For the sauce :

• ½ cup plain Greek yogurt
• 2 tbsp tahini
• 1 tbsp maple syrup
• 1 clove garlic, minced
• 1 green onion, chopped
• Salt and pepper to taste