Toss chiles with 1 tablespoon lime juice in small bowl. Let stand 30 minutes, tossing occasionally.
Meanwhile, combine remaining lime juice, vinegar, oil and Knorr® Chicken flavor Bouillon Cube(s) in medium saucepan. Whisk over medium heat until bouillon dissolves and mixture is hot; remove from heat. Stir in onions.
Pour onions and liquid into bowl; let cool. Add chiles and juice, and oregano. Cover and let stand at room temperature 1 hour for flavors to develop, stirring occasionally.