Step 1

Whisk together the red wine, garlic, bay leaves, salt, and black pepper together in a large glass or ceramic bowl. Add the sirloin cubes, and toss to evenly coat. Cover the bowl with plastic wrap and marinate in the refrigerator for 8 hours or overnight.

Step 2

Preheat an outdoor grill for medium-high heat, and lightly oil the grate.

Step 3

Remove the sirloin from the marinade; shake off excess liquid. Discard the remaining marinade. Skewer the beef onto the prepared skewers.

Step 4

Cook on the preheated grill until the beef cubes start to become firm and are reddish-pink and juicy in the center, 2 to 4 minutes per side for medium-rare.