I think this was my Dutch grandmother's secret recipe, but I can't be for sure. I came across this recipe written by my mom and decided to make it with my boys last night. They had fun and have been gobbling these cookies down ever since. I think they'll make my dad proud too.
1 cup butter
3/4 cup packed organic dark brown sugar
1 egg yolk
1 tbsp vanilla
1 1/4 cup flour
1/4 tsp salt
1/4 - 1/2 cup pure cane sugar (or granulated) for pressing
Beat the butter until it's creamy. Gradually add the sugar while beating. Add vanilla and yolk next. Add flour and salt. Mix well, shape into a ball and wrap with plastic wrap. Chill in the fridge for 2 hours. Roll into 1 inch balls and place on baking sheet. Butter the flat bottom of a glass cup then dip in granulated sugar, press onto cookie balls until flat. Re-dip in the sugar between each pressing for less sticking.
Bake 340 degrees for 10-12 minutes. Cool for a few minutes on the cookie sheet and then carefully remove with a thin spatula onto a cooling rack.
These are great by themselves or with a bowl of vanilla bean ice cream.