07In a cup combine flour and extra water and stir until smooth.
08Add flour mixture to meat and stir until combined.
09Return to heat, stir until it comes to a boil and is thickened.
10Add Worcestershire sauce.
11Simmer uncovered for 10 minutes then remove from heat and refrigerate.
12Once cool fill in bottom of piecrust.
13Put top on and pierce the centre with a knife.
14Combine egg yolk with a bit of water and brush over the top.
15Follow directions on frozen pie crusts or bake at 400 for 5 minutes (or until golden brown) then reduce heat to moderate (200) and cook for an additional 10 minutes.