(pen) Can't stand rhubarb. But blackberry and apple crumble, the very thought..... drools...... You're quite a gardener, then? Not I; just keep it tidy, keep the wilderness under control.
[INJ] Then make your pre-fool (rhubarb puree) now, freeze it until the raspberries are ripe, then add the cream to make the fool and add the fresh raspberries.