Preheat the oven to 120°C/Fan
100°C/Gas ½. On a sheet of baking
paper, mark out a circle roughly
20cm in diameter using a plate or
pan lid as a guide. Place on a baking
sheet and set aside
Melt the chocolate in a heatproof
bowl set over a pan of barely
simmering water, making sure the
bottom of the bowl doesn’t touch
the water. Remove the bowl from the
pan and set aside to cool to
lukewarm or room temperature.
In a scrupulously clean bowl with
electric beaters or in a stand mixer,
whisk the egg whites to stiff peaks.
Gradually add the sugar and salt,
beating constantly until thick and
glossy. It’s crucial that the mixture is
very stiff. Pour the cooled chocolate
over the meringue – don’t stir or beat
it in. Scoop the mixture into the
circle marked out on the baking
paper to make a neat round,
retaining some swirls of chocolate in
the meringue. Bake for 1¼ hours until
crisp on the outside.
Meanwhile, make the cacao nib
cream. Pour 120ml of the cream into
a small pan and add the cacao nibs.
Bring almost to the boil, then
remove the pan from the heat and
set aside to infuse and cool. When
the meringue is cooked, remove
from the oven and leave to cool.
. Increase the oven temperature to
200°C/Fan 180°C/Gas 6. Place the
rhubarb pieces in a baking dish, add
the sugar and toss together, then
spread out in a single layer. Cover
with foil and roast for 15 minutes,
then remove the foil and cook for a
further 5 minutes, or until the rhubarb
is tender but still holding its shape.
Remove from the oven and
leave to cool
Strain the cooled infused cream
and discard the nibs. Whip the
remaining cream until it barely holds
its shape, then stir in the infused
cream. To assemble the pavlova, top
the meringue with the cream and
then the rhubarb and any pan juices,
and serve immediately.