12 -- red pearl onions (3 ounces), peeled and cut in half lengthwise
-- Freshly ground black pepper
Preheat a grill or grill pan until hot.
Place ground coriander and anise seeds in a medium bowl. Add garlic, paprika, cayenne pepper and 1/4 cup olive oil. Season marinade with salt and stir until combined. Add sirloin cubes and stir to coat.
In a medium bowl, combine mushrooms, onions and remaining 1/4 cup olive oil. Season with salt and pepper; toss to coat.
Divide steak among four skewers; thread, leaving 1/2 inch between each cube.
Divide vegetables among another four skewers; thread. Grill the sirloin kebabs until well browned and medium rare, and grill the vegetable kebabs until glistening, tender and slightly charred, 5 to 7 minutes for both. Serve on the skewers.