Combine first 5 ingredients; stir well. Add steak and shrimp; cover and marinate in the refrigerator for 3 to 4 hours or overnight.
Cut a thick slice from top and bottom of pineapple. Quarter pineapple lengthwise; remove rind and core. Cut inot 1-½ inch thick chunks. Set aside.
Remove steak and shrimp from marinade, reserving liquid. Alternate steak, shrimp, pineapple, and mushrooms on skewers for grilling.
Gradually stir cornstarch into reserved marinade in a small saucepan; cook over medium heat, stirring constantly, until thickened and bubbly.
Grill kabobs 3 minutes over medium coals; turn and brush with marinade. Grill 5 minutes or until desired degree of doneness, brushing with marinade as needed.
Your Steak-and-Shrimp Kabobs is ready. Happy cooking!
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