Preheat oven to 425 degrees F. Keep sliced apples in a bowl of water with lemon juice to prevent them from turning brown. In a mixing bowl combine sugar, brown sugar, cinnamon, nutmeg, salt, and cider vinegar. Melt the butter in a saucepan. Stir in flour and cornstarch to form a paste. Add water, vanilla, and previously combined ingredients, and bring to a boil. Reduce temperature and let simmer. Add apples to pan and let simmer for approximately 5 minutes.
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