I came across this recipe in Page One's publication, the Golden Book of Cookies. Unfortunately, I placed the dough in a straight line instead of weaving them and so my cookies ended up as striped cookies. Fortunately, they tasted very yummy. :) :)
Sift 200 gms maida with 1/2 tspn baking powder and 1/8 tspn salt. Beat 150 gms butter with 100 gms granulated sugar and 1/2 tspn vanilla extract till creamy. Mix in the sifted maida to firm a stiff dough. Divide dough in half and knead 2 tblspn unsweetened cocoa powder to one half. Make three logs from each dough. Place the white , brown and white logs next to each other . Beneath it place the brown, white and brown dough. Press all of them together. The recipe book actually has us sticking the logs to each other by brushing egg white on the logs. But mine stuck together by just pressing. U will now have a rectangular log. Now wrap in a cling film or foil and refrigerate for an hour ( important). Remove and slice dough in thin pieces. Use a sharp knife. Preheat oven at 375 F or 190 C ( gas 5). Butter cookie sheets and bake until slightly browned for 10-15 mins. Mine were ready in 15 mins . They may seem soft initially but they become firm on cooling. If u bake in two lots, u may like to check progress after 10 mins for the second lot. As the oven is hot, the second lot may bake faster.