Pre-heat oven at 220 degrees Celsius.
Brown meat and onion.
Add 3/4 cup of the water, bouillon cubes, ketchup and Worcestershire sauce, pepper, oregano, and nutmeg.
Boil and cover for 15 minutes.
Blend flour with the remaining 1/4 cup water until it becomes a smooth paste; add to the meat mix.
Grease a pie dish and line with puff pastry.
Add the cooled filling mixture; brush edges of pastry with milk or beaten egg; put the pastry top on; press edges down with a fork.
Trim edges and glaze top with milk or beaten egg.
Bake in a very hot oven, 220 degrees Celsius for 15 minutes.
Reduce heat to 180 degrees Celsius and bake for 25 more minutes, or until golden brown.
Serve with veggies, fries, or salad.