COOKIES:
1 C. butter, softened (no substitutes)
1/2 C. sugar
1 tsp. vanilla
1 egg yolk
2 C. all-purpose flour

LEMON FILLING:
1/2 C. butter, softened
2 C. powdered sugar
2 T. lemon juice

DIPPING CHOCOLATE:
4 - 1 oz. squares semi-sweet chocolate
2 T. butter
1/2 C. nuts, finely chopped

COOKIES: Cream butter and sugar. Beat in egg and vanilla. Shape into 1″ balls and place on ungreased baking sheets. Flatten to 2″ with a glass dipped in sugar. Bake at 350º for 10 to 12 minutes, or until firm. Remove to racks and cool.

LEMON FILLING: Combine ingredients. Spread on half of the cookies and top with the other half, making a sandwich.

DIPPING CHOCOLATE: Melt chocolate and butter; stir until smooth. Dip each cookie halfway in chocolate, then in nuts. Place on waxed paper to harden.