Step 1

For the marinade: In a mixing bowl whisk together all marinade ingredients.

Step 2

For the kebabs: place steak into a gallon size resealable bag. Pour marinade over steak then seal bag while pressing out excess air and message marinade over steak. Transfer to refrigerator and allow to marinate 3 - 6 hours.

Step 3

Preheat a grill over medium-high heat to about 425 degrees (partway through preheating clean grill grates if they aren't already clean).

Step 4

With veggies on cutting board, drizzle with oil and lightly toss to coat (I actually don't toss the onion because I like it to stay in chunks, when you thread the onion on layer in chunks about 2 - 3 slices so they don't burn up).

Step 5

Sprinkle veggies evenly with garlic powder and season with salt and pepper. To assemble kebabs layer steak and veggies onto kebabs in desired order, work to fit 4 steak pieces onto each kebab (I like to layer 2 onion slices together).

Step 6

Brush grill grates lightly with oil. Place kebabs on grill and grill until center of steak registers about 140 - 145 degrees for medium doneness, turning kebabs occasionally, about 8 - 9 minutes. Serve warm.