What causes meringue to shrink and leak?
If the meringue is not sealed well around the pie it can shrink back away from the edge of the pie. To seal the meringue, spread it so it touches the edges of the pie crust all around the pie. Add 1/8 teaspoon cream of tartar per egg white to the meringue mixture. This will help to keep the meringue from shrinking. Also an oven that’s too hot can cause meringues to shrink.
