Melt butter in heavy-based 25cm frying pan; add brown sugar and cinnamon; cook, stirring, until sugar dissolves. Remove from heat.
4
Place apple rings, overlapping slightly, on top of caramel in pan. Return to heat; cook, covered, over low heat, 2 minutes. Uncover; cook, over low heat, about 5 minutes or until apples are tender. Remove from heat.
5
Meanwhile, combine flour, milk and egg yolks in medium bowl.
6
Beat egg whites in small bowl with electric mixer until soft peaks form; gradually add caster sugar, beating until dissolved between additions. Fold egg white mixture into flour mixture, in two batches.
7
Spread mixture carefully over apple in pan. Bake, uncovered, in oven, about 12 minutes. Turn onto serving plate; serve sprinkled with coconut and, if you like, vanilla ice-cream