Whisk together sugar and cornstarch in a small bowl. Separate eggs and set yolks aside.
In a large mixing bowl on medium-high speed, whisk egg whites with cream of tartar and salt until the beater leaves soft tracks in the foam. Begin adding sugar mixture 1 tablespoon at a time, gradually, but steadily. Once the sugar has been incorporated, add the vanilla and increase the speed to high until the meringue looks glossy and holds a stiff peak when the beater is lifted.
Drop a large spoonful of meringue onto the parchment paper and shape into a circle with a slightly depressed center. Repeat with the remaining meringue to make 8 (3-inch) shells. Or place meringue in a large pastry bag with a fluted tip and pipe 8 nests onto the paper, working from the center and raising the sides. Make little "kisses" -- small dollops -- with any leftover meringue, to top the finished meringue or to eat separately.
Place in the oven. Reduce heat to 200 degrees. Bake for 11/2 hours. Turn off the oven and leave meringues inside to cool completely, another 3 hours, or overnight.
To serve, whip cream. Place a spoonful of lemon curd in each shell, then top with whipped cream and fruit.
Nutrition information per serving with 1/8 cup of fruit and 2 tbsp. lemon curd: