Spicy and Sweet Shrimp with Pineapple

Stir together soy sauce, rice wine vinegar, honey, corn starch and sesame oil in a small bowl. Heat 2 tsp. vegetable oil in a large skillet over medium high heat. Add shrimp, garlic, ginger and crushed pepper flakes. Cook 2 minutes, stirring frequently. Transfer shrimp mixture to a bowl. Add remaining 2 tsp. vegetable oil to the skillet. Add bell pepper and cook, stirring, 2 minutes. Add pineapple cubes, green onions and shrimp mixture to skillet. Cook, stirring, 2 minutes until shrimp are just done. Stir in soy sauce mixture. Cook, stirring, 1 minute until sauce is thickened. Serve immediately over hot, cooked rice if desired.