Phase 2 & 3 | Serves 4
Prep time: 15 minutes | Total time: Overnight 

Ingredients

1/4 cup olive oil (Phase 3 only)
2 tablespoons finely chopped oregano
2 garlic cloves, minced
2 teaspoons ground cumin
1 teaspoon ground coriander
1/4 teaspoon cayenne
2 pounds sirloin flap steak or flatiron steak, cut into 1 1/2-inch pieces

Directions

1. Stir together oil, oregano, garlic, spices, and 1 teaspoon salt in a bowl, then toss with beef. Marinate, chilled, at least 2 hours.
2. Prepare grill for direct-heat cooking over medium-hot charcoal (high heat for gas).
3. Thread about 4 pieces of beef onto each skewer, leaving small spaces between pieces, then transfer to a tray.
4. Oil grill rack, then grill beef, covered only if using a gas grill, turning, until browned but still pink inside, 4 to 5 minutes.