Freeze the ice-cream in the coldest section of the
freezer and cut the sponge to match the top of the
ice-cream tub, then freeze the sponge on a baking
sheet overnight.
Preheat the oven to 230°C/450°F/Gas
mark 8.
To make the meringue, whisk the egg whites
with an electric mixer to form soft peaks.
Increase
the mixer speed and gradually add the sugar until
the peaks are firm,
but take care not to take it too far or the meringue
will separate.
Spread the sponge with the
jam. Turn out the ice-cream to sit on top of the
jam.
Smooth the meringue all over it with a palette
knife, taking it right down to the edge to seal the
ice-cream in entirely, with no gaps.
Bake for 4 to 5
minutes, until the meringue is just beginning to color. Remove
from the oven and serve immediately.