1Place asparagus in 8-inch square (2-quart) microwavable dish; add 1/4 cup water. Cover; microwave on High 6 to 9 minutes or until crisp-tender; drain.
2In tightly covered container, shake oil, vinegar, oregano, salt, pepper, mustard and garlic until well blended. Pour vinaigrette over hot asparagus, turning asparagus until well coated. Cover and refrigerate 2 to 3 hours or until chilled.
3Just before serving, remove asparagus from vinaigrette; reserve vinaigrette. Arrange asparagus, romaine and tomato in separate sections on serving platter. Drizzle vinaigrette over vegetables. Garnish with radish roses.