Prepare rice according to package directions.
Combine shrimp and cornstarch in bowl. Toss to coat.
Heat oil in skillet or wok fry shrimp until golden. Transfer shrimp to paper towel-lined plate. Drain oil from wok.
Add garlic to wok and stir in orange sauce and pineapple. Heat sauce to simmer. Add shrimp and stir to coat.
Serve shrimp over hot cooked rice.