If using wooden skewers soak them for at least 30 minutes, or up to an hour.
Cut the chicken breasts into cubes, making sure they are all about the same size for even cooking. Place the chicken pieces in a large ziploc bag and pour in the tamari sauce. Seal the bag properly, then give it a shake. Marinate in the fridge for about an hour if you have time. If not, just give it a quick one while you preheat the grill and prep the other ingredients. Even 20 minutes is good.
Preheat your grill to a medium heat.
Cut up the fruit so the pieces are about the same size as the chicken you cut previously. Place each fruit in a bowl and set aside.
Remove the chicken from the fridge about 20 minutes before you want to place it on the grill, 30 minutes is ideal. Cooking cold meat is never a wise idea. Discard marinade and place the chicken on a plate or platter while you get ready to load the skewers.
Start laying your chicken and fruit on the skewers in any order you like. It's okay to have fun with this part. If you are worried about meat being on the same skewer as fruit you can do each item on separate skewers. Whatever floats your boat. If you layer them all on the same skewer remember not to pack them too tightly onto the skewer. You want there to be a small gap between ingredients so the food cooks thoroughly.
Place the remaining half of the tamari sauce in 3 small bowls, and be sure to bring grill brushes out with you. I tend to be super careful with poultry, try not to cross contaminate things. Use a different brush each time you coat these. I buy cheap brushes at the dollar store for stuff like this, or you can find really inexpensive brushes at your local hardware. I buy those little wooden ones for painting and use those for things like this. You can just pour from the bottle too. Helps avoid any cross contamination when dealing with poultry.
I also recommend bringing out 1/4 cup of vegetable oil (just cheap stuff for this) in a dish and a brush for that as well. You want to carefully brush the oil on the grill grates before putting the food on the grill. This helps tremendously with cooking on the grill and not having your food stick. Another tip is to make sure your grill grates are clean, it makes a huge difference when cooking. Less sticky, less aggravation, better food.
I also brush a little oil over the kebabs just before they go on the grill. Not a lot, just a touch.
Place the kebabs on the grill, brush with tamari sauce, close the lid and cook for about 3 to 5 minutes.
Open up the lid, and flip the kebabs over. Brush some tamari sauce on, close the lid and allow to cook for another 2 to 4 minutes.
Remove the kebabs and brush with a bit more tamari sauce. Coat them evenly on all sides.
Serve with a big old kebab-loving smile!