Saute onion in margarine in a large nonstick skillet over medium-high heat until tender. Stir in jalapeno pepper, gingerroot, and garlic; saute 2 minutes. Add curry powder; saute 2 minutes. Add coconut milk; bring to a boil. Reduce heat, and simmer 3 minutes or until slightly thickened, stirring frequently. Stir in salt and white pepper. Add shrimp; bring to a boil. Reduce heat, and simmer 5 minutes or until shrimp turn pink.
Place rice on a serving platter; spoon shrimp mixture over rice. Sprinkle with green onions and parsley. Serve immediately.