2 tbsps fresh oregano leaves or 1 tsp dried oregano
1/2 c sliced green onions, including tops
2 tbsps balsamic vinegar
2 tbsps minced fresh jalapeño chilies
Thinly sliced fresh tomatillos (optional)
16 round or oval rolls (about 2 in. wide)
1 red onion (3/4 lb.)
1/4 c sliced garlic
1 tsp ground cumin
About 2 tsps olive oil
1 beef flank steak (1 1/2 to 1 3/4 lb.)
Directions
Step #1 In a mixer or food processor/blender, green onions, chilies, oregano, whirl garlic, cumin, & vinegar until coarsely puréed.
Step #2 Rinse flank steak & pat dry.
Step #3 Rub garlic mixture over meat.
Step #4 Peel red onion; cut crosswise into 1/2-inch slices.
Step #5 Rub lightly with olive oil.
Step #6 Cut rolls almost in half horizontally, leaving attached on one side.
Step #7 Pile into a basket.
Step #8 Lay steak & onion slices on a barbecue grill over a solid bed of very hot coals or high heat on a gas grill (you can hold your hand at grill level only 1 to 2 seconds); close lid on gas grill.
Step #9 Cook meat, turning to brown evenly, 12 to 15 mins for rare, until as done as desired in center of thickest part (cut to test), about 20 mins for medium-rare.
Step #10 Grill onion slices, until lightly browned on each side, turning with a wide spatula, about 13 mins.
Step #11 Transfer meat & onion to a carving board.
Step #12 Serve hot, warm, or cool.
Step #13 Cut beef across the grain into thin, slanting slices.
Step #14 Tuck slices of meat & pieces of red onion into rolls.
Step #15 Spoon chipotle crema into rolls, & add tomatillo slices, if desired.
Step #16 Nutritional analysis does not include chipotle crema or tomatillos.