Place Group 1 into a mixing bowl and mix until a smooth batter. Add Group 2 to Group 1 in 3 stages and scrape down. Sieve Group 3 and add to Group 1 and aerate for 3 minutes on second speed Fold Group 4 into batter Scale at 650g in 18cm baking tins Oven temperature 175¡C Baking time 50 minutes approximately