Place egg whites, tartar and salt into a mixer bowl with a whisk attachment and whisk on low speed until you get a soft foam.
Combine the sugar, starch and zest together and gradually sprinkle into the whites, one tablespoon at a time.
Whisk until the meringue is stiff and glossy, takes about 10-12 minutes.
Add the vanilla in and give it a brief whisk.
Dollop onto a line baking tray and gently spread out into to 3cm x 10cm discs.
REDUCE THE OVEN HEAT to 110C, bake 1hr (1hr 20m if making one large pavlova)
Turn the heat off and allow to cool completely in the oven with the door closed. Takes and hour or two.
For the Chocolate cream, heat cream to just under a boil. Pour the hot cream over the grated chocolate.
Allow to sit for 1 minute and then give it a good whisk to dissolve the chocolate.
Refrigerate the chocolate cream until it is cold, then whip to soft peaks.
Transfer to a piping bag and pipe onto the meringues.
Serve drizzed with caramel sauce (store bought or homemade), topped with toasted walnuts and a sprinkling of sea salt.