3 eggs 
1/4 teaspoon salt 
1 cup sugar 
1 teaspoon vanilla extract 
1 cup all-purpose flour 
1/4 pound unsalted butter, melted and cooled 
optional:  freshly grated lemon zest or almond paste. 
optional:  dust with powdered sugar after baking. 
Preheat oven to 375 F.  Butter and flour the madeleine pans.  If using 
a non-stick pan, only use cooking spray.  Beat the eggs, salt, and sugar 
together until thick, 8 minutes.  Add the vanilla.    Fold in the flour, 
rapidly, but gently.   Fold in the butter gently.  Quickly spoon the 
mixture into the madeleine pans, about 3/4 full.  Bake until golden, 
about 8-10 minutes. Watch carefully.  Remove from pans, cool on 
racks.