Vegetarian Burger with Avocado Salsa

Preheat broiler if manufacturer directs. Cut avocado lengthwise in half; remove seed and peel. In bowl, mash avocado; stir in green onion, salsa, lemon juice, cilantro, and salt. Prepare vegetarian soy burgers as labels direct. Meanwhile, toast sandwich rolls and slice tomato. On 4 dinner plates, arrange lettuce leaves on bottom halves of toasted rolls; top with tomato slices, burgers, and avocado mixture. Replace tops. Serve with alfalfa sprouts.