Heat oven to 275°F. Line cookie sheet with cooking parchment paper. In large bowl, beat egg whites and 1 teaspoon lemon juice with electric mixer on medium speed until soft peaks form. On high speed, gradually beat in 3/4 cup sugar, 1 tablespoon at a time, until stiff glossy peaks form and sugar is almost dissolved. Spread two-thirds of meringue into 10-inch round on cookie sheet. Using remaining 1/3 of meringue, spoon or pipe dollops around edge of round to form shell.