In a mixing bowl cream butter and sugar. Beat in egg yolk and vanilla extract.
Combine the flour baking powder and salt gradually add to creamed mixture and
mix well. Divide dough in half add extract and red food coloring to one portion.
On a work surface, roll out each portion of dough between wax paper into a 16
x 10-inch rectangle. Remove wax paper. Place red rectangle over plain rectangle
roll up tightly jellyroll style starting with long side. Wrap in plastic wrap.
overnight or until firm.
Unwrap the dough and cut into 1/4-inch slices. Place 2 inches apart on lightly
greased baking sheets.
Bake at 350 degrees F for 12-14 minutes or until set.
for 2 minutes before removing to wire racks to cool completely.