1. Put oil in large pot on high heat.
2. When VERY hot, sauté onion and garlic, then ADD Worcestershire sauce.
3. Mix curry powder in approximately 1 cup of water; ad to onion mix. Reduce heat and let simmer for approximately 30 minutes, stirring so that mixture doesn't stick to pan. ADD prawns and more water if needed; let simmer until prawns are cooked.
4. SERVE HOT WITH HOT COOKED RICE.