While crust is cooling, prepare filling. In a double boiler add 2 cups water, 1 cup sugar and the cornstarch. Add rinds. Stirring constantly until thickened. Add butter , lemon juice and sea salt. Continue to cook and keep stirring about 5 minutes. Add beaten egg yolks and cook and stir another 5 min. Take off heat and cool.

Once filling is cool and thick put it into the pie crust.

Make meringue. Place egg whites into mixer and beat on high until fluffy. Add cream of tartar. Continue beating and slowly add the sugar. Beat until soft peaks form.

Spread meringue over pie making sire to cover all edges. Bake 400/degrees F about 5 min or until light brown.

Cool completely in fridge at least 4/hrs before serving. Enjoy!