Have fresh and flavorful steak tacos for lunch using avocado, jalapeno, arugula and sour cream.
Rub chili powder on both sides of steak. Place steak on grid over medium, ash-covered coals. Grill covered, 11 to 15 minutes (over medium heat on preheated gas grill, covered, 13 to 16 minutes) for medium rare (145°F) to medium (160°F) doneness, turning occasionally
Grill corn tortillas 30 seconds on each side. Remove from grill; keep warm.
Place avocado, lime juice, sour cream and jalapeño pepper in bowl of food processor; pulse until smooth.
Carve steak into thin slices. Top tortillas with equal amounts steak and arugula; top with avocado cream. Pass remaining avocado cream.