Soften Group 1 but do not melt. Place in machine bowl. Sieve Group 2 and add to above. Blend on second speed until a fine crumbly mixture forms. Add 1/3 of Group 3 and mix on second speed for one minute. Scrape down and add remaining 2/3 of Group 3 over a period of three minutes on slow speed. Scrape down thoroughly and mix on second speed for 6 minutes. Bake at 170¡C.