Butter a baking sheet and line it with buttered parchment paper. Set aside.
Mix the vinegar, cornstarch and vanilla in a small bowl and set aside. In a stand mixer, whisk the egg whites until soft peaks form. With the mixer running, slowly add 1/4 cup of sugar. Continue beating to stiff peaks. Slowly whisk the vinegar mixture into the meringue until well incorporated.
Spread the meringue evenly on the prepared baking sheet.
Sprinkle the coconut, walnuts, almonds and pecans evenly over the meringue.
Bake until the coconut begins to turn golden and the whites are shiny and springy, about 10 to 12 minutes. Cool completely.
Meanwhile, combine the strawberries and drained pineapple in a bowl and set aside.
In a clean bowl whisk the heavy cream and remaining 1 tablespoon of sugar to stiff peaks and reserve.
Use a knife to release the edges and remove the meringue from the pan. Gently flip the meringue onto a parchment-lined surface, nut side down.
Spread the whipped cream over meringue and sprinkle evenly with strawberry mixture, leaving a 1-inch border around the perimeter of the meringue. Leave a little extra room at 1 of the short ends to help seal the pavlova when it's rolled. Starting with the short side with more fruit, slowly roll the meringue into a log, keeping the roll as tight as possible and tucking in the fruit as you go. Use a serrated knife to slice the ends for clean edges.
Cut into 2-inch slices and transfer to a serving dish for serving.
