In a small saucepan combine cornstarch and water.
Add remaining sauce ingredients into saucepan and whisk to combine.
Bring to boil over medium heat.
Reduce heat to low and allow to simmer for 5 minutes.
Reserve 1/4 cup sauce.
Chop up steak and chicken into bite size pieces and slide onto kabob sticks. (I put all the steak together and all the chicken together for more even cooking)
Slide shrimp onto kabob sticks as well.
Place on grill over medium heat. (about 350F)
Brush teriyaki sauce over everything and let cook for 2-3 minutes.
Turn a quarter turn and repeat step 9.
Repeat steps 9-10 until cooked through. (should take less than 10 minutes to cook everything)
Remove meat and shrimp from kabobs and layer on to toothpicks chicken on bottom, then steak and shrimp on top.
Dip into remaining teriyaki sauce