Chipotle tomatillo salsa

1. Pureei chilies in blender.
2. Transfer to large bowl.
3. Heat 1 teaspoon oil in heavy large skillet over high heat.
4. Add tomatillos and cook until brown on all sides, about 7 minutes.
5. Transfer to work surface.
6. Add 2 teaspoons oil to skillet.
7. Add onion and saute until tender, about 4 minutes.
8. Add onion to chilies.
9. Chopi tomatillos; add to chili-onion mixture.
10. Mixi in cilantro, vinegar and oregano.
11. Seasoni with salt and pepper.
12. (can be made 2 days ahead.
13. Cover; chill.
14. Bring to room temperature).
15. *chipotle chilies and tomatillos are available at latin american markets, specialty food stores and some supermarkets.
16. Makes 1-½ cups.