Peel shrimp, and devein, if desired.
Whisk together sherry and 2 teaspoons cornstarch in a medium bowl; add shrimp, coating well. Chill 30 minutes, turning occasionally.
Heat 2 teaspoons vegetable oil in a large nonstick skillet or wok at medium-high 2 minutes. Add ginger and next 3 ingredients; cook 1 minute or until tender. Remove vegetables from skillet; discard ginger.
Remove shrimp from marinade, discarding marinade.
Heat remaining 1 teaspoon vegetable oil in skillet; add shrimp, and cook, stirring often, 2 minutes or until shrimp turn pink. Return vegetables to skillet; stir in pineapple juice and next 3 ingredients.
Stir together 2 tablespoons water and remaining 4 teaspoons cornstarch; add to shrimp mixture. Bring to a boil; cook, stirring constantly, 1 minute or until thickened. Serve over rice. Prep: 40 min., Chill: 30 min., Cook: 6 min.
*Most of the cholesterol comes from shrimp. But they're also low in saturated fat, which makes them a nutritious, heart-healthy choice.