Step 1

Soak the wooden skewers in water for 20 minutes.

Step 2

Preheat grill to medium-high.

Step 3

Slice the flank steak against the grain into 16 to 20 strips; they should be between ⅛-inch to ¼-inch thick.

Step 4

Season the steak slices with cumin, salt, and pepper.

Step 5

Thread the steak onto the skewers, accordion style. Set aside.

Step 6

In a blender combine olive oil, chopped cilantro, garlic, red wine vinegar, lemon juice, pepper flakes, salt, and pepper. Pulse until thoroughly combined, then set aside.

Step 7

Brush the grill grates with olive oil.

Step 8

Place steak skewers on the grill and cook for about 1 minute per side, or until browned and grill marks appear.

Step 9

Remove steak skewers from grill.

Step 10

Brush steak with chimichurri sauce.

Step 11

Garnish with red pepper flakes, if you like, and serve.