For the grill:
Do you pronounce cumin 'cyoo-min,' like I do? Or are you a 'coo-min' person? How about 'cyoo-pon' versus 'coo-pon'?
1/4 cup olive oil
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
Equipment: 12 (12-inch) skewers, soaked in water 30 minutes if wooden
Stir together oil, oregano, garlic, spices, and 1 teaspoon salt in a bowl, then toss with beef. Marinate, chilled, at least 2 hours and up to 8 hours.
Prepare grill for direct-heat cooking over medium-hot charcoal (high heat for gas). These can also be broiled on an oiled broiler pan about 3 inches from heat.Thread about 4 pieces of beef onto each skewer, leaving small spaces between pieces, then transfer to a tray.
Oil grill rack, then grill beef, covered only if using a gas grill, turning, until browned but still pink inside, 4 to 5 minutes.