From a neighbor while attending BYU
1/2 C butter
1/4 C brown sugar
1 egg yolk
1/2 tsp vanilla
1 C sifted flour
1/4 tsp salt
Cream butter and brown sugar. Add egg yolk and vanilla. Stir in flour and salt . Whisk egg white in a small bowl. Chop pecans and put in a small bowl. Make small (1″) ball and coat in whisked egg with a little water, then roll in chopped pecans to coat.
Bake 5 min at 375, remove and place thumb print in each ball, then bake a further 6-8 min or lightly browned. Cool then put a dab of icing in the thumbprint.
Icing: Butter, powdered sugar and maraschino cherry juice stirred to a smooth but thick consistency.