Response:  1. Whole wheat bun - 150 calories
  2. Beef patty - 300 calories
  3. Lettuce - 5 calories
  4. Tomato - 10 calories
  5. Cucumber - 5 calories
  6. Onion - 10 calories
  7. Mayonnaise - 50 calories
  
  Total calories: 530 calories