Measure flour by dipping method or by sifting.
Blend flour, sugar, and salt in bowl.
Mix in shortening, egg yolk, milk, and vanilla thoroughly with fork.
Heat oven to 375 °
Form dough in 1" balls.
Place on ungreased baking sheet.
Press 1/16" thick with bottom of greased glass dipped in sugar.
Dough must be pressed very thin so cooky is wafer-like; otherwise it will be too chewy.
Brush with slightly beaten egg white.
Sprinkle with pecans.
Bake 8 to 10 min.
Do not overbake