First poach the red apple: Put whole into a pan of simmering water and poach gently for 6 minutes; remove and leave until cool enough to handle.
Meanwhile, prepare the the whiskey sauce: Place the egg yolks, caster sugar and whiskey in a bowl set over a pan of hot water and whisk until pale and fluffy. (Take care not to overheat or the sauce will curdle.) When it is thick and creamy, remove from the heat and keep warm until required.
To complete cooking the apples:
Slice off and reserve the top of the red apple, then carefully scoop out and chop the flesh; remove the core and discard. Peel, quarter and core the green apple and cut into slices like orange segments. Melt the butter in a heated pan and sauté the apple segments in it briefly with the cinnamon, cloves, sugar and honey. Remove apple as it is cooked, discard the spices and reduce remaining liquid if necessary. (Alternatively, if there is not enough juice, work in a little cold butter and cream over low heat to make a sauce).