Cream butter; add sugar gradually. Beat in egg and vanilla. Blend in flour. Dough is soft. Remove 1/4 cup dough to add to walnut filling. Knead remaining dough in hands until pliable. Use star-shaped cookie press plate. Press dough through cookie press onto ungreased cookie sheets to form 3-inch strips. Join ends to make wreaths. For walnut filling, combine 1/4 cup reserved dough, walnuts, vanilla, and corn syrup. Place a teaspoon of filling in center of each wreath. Decorate with bits of candied cherries and citron. Bake at 350 degrees for about 15 minutes or until delicately browned. Makes 4-1/2 dozen.