All ingredients are readily available at Tesco, Sainsbury’s, Waitrose, ASDA, and Morrisons. Beef sirloin can be found in the fresh meat section, and bell peppers, red onions, cucumber, and fresh dill are in the produce section. Greek yogurt is available in the dairy aisle, while olive oil, garlic powder, and wooden skewers can be found in the pantry and kitchen supplies sections.