Frozen Strawberry Lemon Meringue Torte

Line 2 buttered baking sheets with parchment paper or foil and on them trace 3 circles using the bottom of an 8 1/2-inch springform pan as a guide. In a large bowl with an electric mixer beat the egg whites with a pinch of salt until they hold soft peaks, add the sugar gradually, beating, and beat the whites until they hold stiff glossy peaks. Transfer the meringue to a pastry bag fitted with a 1/2-inch plain tip, beginning in the middle of each parchment circle pipe the meringue in a tight spiral to fill in each circle, and smooth the tops. Bake the meringues on 2 racks in a preheated 250 °F. oven, switching the baking sheets from one rack to the other every 30 minutes, for 1 to 1 1/2 hours, or until they are firm when touched and very pale golden. Remove the parchment with the meringue from the baking sheets, let the meringue cool on it, and peel off the parchment carefully. The meringue layers may be made 1 day in advance and kept, wrapped well in plastic wrap, at room temperature. With a serrated knife trim the meringue layers so that they will just fit inside the 3 1/2-inch springform pan. Oil the pan, line it with plastic wrap, leaving on overhang, and arrange 1 of the meringue layers, smooth side down, in the bottom.