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Combine sugar and cornstarch in medium saucepan. Gradually stir in evaporated milk. Cook over medium heat, stirring constantly, until mixture comes just to a boil and slightly thickens. Remove from heat and add vanilla, lime zest & rum. Refrigerate for 2 hours or until well-chilled.", "FOR THE FLOATING ISLAND:", "Preheat oven to 325 degrees with rack in center. Fill a large roasting pan halfway with water and transfer to oven.", "In the bowl of an electric mixer fitted with the whisk attachment, slowly whisk whites and salt until slightly foamy. Add cream of tartar, and gradually increase the speed to high. Add sugar, 1 tablespoon at a time, until meringue is stiff; lower speed and add vanilla, whisking until combined.", "Spray a tube pan or angel-food cake pan without a removable bottom with baking spray. Transfer meringue to pan. Use a rubber spatula to press meringue down in order to remove any air pockets and smooth the surface.", "Transfer to prepared roasting pan. Bake until lightly golden and puffed, 45 to 55 minutes. Don't worry if meringue has risen above rim of pan. It will deflate quite a bit as it cools. Transfer to a wire rack, and cool completely; meringue will deflate as it cools. Invert into a shallow serving bowl, and chill until ready to serve.", "FOR THE CARAMEL SYRUP: