I usually have a milk shake as soon as I put the bike away.I don't get the problem on audax rides,because I eat plenty on the way round,but at the moment I am doing reliability rides on just a banana or flapjack.I guess it will get easier when my body adapts and the club runs became a bit more sociable with cafe' stops in the spring.
mattcs' idea of preparing something in advance is good.IE eat something quick,shower,then something more substantial.