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Soak apples in salt water for about 10 minutes to remove pesticide residues. Peeling them directly will also work.

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2

Prepare a pot of cold white water, put the right amount of salt and two slices of lemon.

3

Rub out the apple slices with a paring knife. Put them directly into the prepared water to soak for a minute.

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4

Preheat the oven at 100 degrees for 5 minutes, fish out the apple slices and put them on a baking sheet, drain them slightly and put them in the oven.

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5

The oven is adjusted to the temperature of the upper and lower tubes at 100 degrees, and the time is set for 1 hour

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6

Just out of the oven, apple slices are a little soft. They will harden afterward. Done!

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