Place remaining walnuts in bowl. With sharp knife, cut crosswise through ice cream and container to remove strawberry ice cream along the edge of flavor (see photo 1). Freeze remaining ice cream. Cut strawberry ice cream lengthwise into two 1/2-inch wide slices. Using a 2-1/2-inch biscuit cutter, cut out 2 circles from each slice, for a total of 4. Place each circle on flat side of cookie; top with another cookie, flat side down. Roll edge in remaining chopped walnuts.