Peel, core, and thinly slice the apples.
In a large pan over medium heat, toss the apples with the lemon juice and lemon zest.
Add the brown sugar, granulated sugar, cinnamon, nutmeg, salt, and ½ cup water. Stir to coat the apples.
Cook for 8-10 minutes, stirring occasionally, until apples begin to soften.
In a small bowl, whisk the cornstarch and the two tablespoons of water until smooth. Stir into the pan with the apple mixture.
Cook for 2-3 more minutes, or until thickened and apples are tender but not mushy.
Remove from heat and cool before using in pies, crisps, or as a topping. Enjoy!