Cube the beef, peppers, and onions into the size you prefer.
Marinate the beef cubes with the marinade ingredients. Cover and let it sit in the fridge for 30 minutes.
When the beef marinates, assemble the skewers with the beef cubes and veggies.
Tear off a long sheet of foil, about 16-18 inches long and lay it flat on the counter or tray. Place the skewers onto the center of the foil sheet.
Bring up the long sides of the foil, so the ends meet over the food. Doubt fold the ends, leaving room for the heat to circulate inside. Fold to seal both short ends. The skewers end will not seal completely, don't worry too much about that. Refer to blog photos.
To avoid juices puddling around the food, use a skewer to place holes on the bottom side of the packet.
Grill the skewers for about 5 minutes and then turn the skewers over (just the skewers not the whole pack) to grill on the other for another 5 minutes. Grilling time varies based on your liking.
Remove the skewers from the grill and transfer onto a dish lined with a new sheet of aluminum foil for easy cleanup.
Garnish with some parsley and serve with your favorite dip, BBQ seasoning and side dish.