Cut your steak into large pieces (around 1¼ – 1½ inches). Try to keep them uniform in size so they’ll cook in the same amount of time.
Add your steak, shrimp, and all marinade ingredients to a gallon ziploc bag. Squeeze out excess air and zip closed. Use your fingers to massage the marinade evenly around everything. Let sit for at least 1 hour, flipping the bag over occasionally.
Thread your marinated steak and shrimp onto skewers.
Heat grill to medium-high heat. Place kabobs on the grill so they’re not touching. Grill for 3-5 minutes. Flip. Grill for another 3-5 minutes. Remove when you’ve achieved your desired doneness.