Spumoni Slices

• 1 egg
• 1 few drops green food coloring powdered sugar icing
• 1/2 flour
• 375 gr all purpose flour
• 200 gr sugar
• 110 gr margarine
• 95 gr shortening
• 65 gr pistachio nuts (chopped)
• 45 gr candied (chopped red)
• 30 ml milk