1. Heat oil in a pan, fry chicken, garlic and ginger. Add onion and stir-fry until onion is tender.2. Add tomato and water, and cover, bring to boil. Reduce heat and simmer for 5 minutes.3. Mash tomato. Turn the heat off, add Curry sauce Mix. Stir until sauce mixed are completely melted.4. Add Worcester sauce and simmer for 3 minutes. Add avocado and stir carefully not to mash avocado.5. Serve over rice, and garnish with chervil, if desired.