4 avocados, halved, seeded, peeled, and chopped 1 14.5 ounce can diced tomatoes, undrained 3 tablespoon snipped fresh cilantro 2 tablespoon lime juice 1 tablespoon prepared horseradish 1 tablespoon Worcestershire-style marinade for chicken ¼ teaspoon salt ¼ teaspoon ground black pepper