1/2 cup butterSift together, then add
1/4 cup brown sugar
1 egg yolk (reserve the white)
1/2 teaspoon vanilla
1 cup flour -- siftedChill dough, then roll into 1" balls.
1/4 teaspoon salt
Dip them into
1 beaten egg whiteThen roll them in
finely chopped walnutsPlace 1 inch apart on ungreased baking sheet.
Bake 5 minutes at 350°F.
Remove from oven and quickly press thumb gently into the top of each cookie.
Fill each thumbprint with about 1/4 teaspoon
strawberry or raspberry jamReturn to oven and bake about 8 minutes longer, until golden.
When I was a kid, my mother used to make these at Christmastime. They were my favorite.