Orange-Flower Pavlovas with Strawberries

Position rack in center of oven and preheat to 275 °F. Line large baking sheet with parchment paper. Using cookie cutter or glass as aid, trace six 2 1/2-inch circles on parchment, spacing 2 to 3 inches apart; turn parchment over. Using electric mixer, beat egg whites in large bowl until soft peaks begin to form. With mixer running, gradually add 6 tablespoons sugar. Whisk 2 tablespoons sugar and cornstarch in small bowl. With mixer running, gradually beat sugar-cornstarch mixture into meringue. Continue beating meringue until stiff glossy peaks form. Beat in vinegar and orange-flower water. Divide meringue among parchment paper circles, spreading to fill completely (meringues will be about 1 1/2 inches high). Using back of spoon, form slight depression in center of each meringue. Bake meringues until beige and dry to touch, about 20 minutes. Turn off oven and prop door open slightly with wooden spoon. Let meringues cool in oven until completely dry, about 1 hour. Transfer to rack to cool completely. DO AHEAD: Can be made 1 day ahead. Store airtight at room temperature.