Filipino Style London Broil

http://www.epicurious.com/recipes/food/views/Filipino-Style-London-Broil-231537

• 2 medium-size lemons
• 1 cup soy sauce
• 1/2 cup distilled white vinegar
• 1/2 cup vegetable oil
• 1 medium-size onion, finely chopped
• 3 cloves garlic, finely chopped
• 3 bay leaves, crumbled
• 1 tablespoon coriander seed
• 1 teaspoon black pepper
• 1 flank steak or piece of sirloin or top or bottom round steak (1 1/2 to 1 3/4 pounds; see Note below)