Line a large (13x18) baking sheet with parchment paper. Set it aside.

Fill a bowl with a cup of water and the lemon juice, stir to combine.

Core and chop the apples into 1 ½ inch cubes. As you are chopping the apples transfer them into the bowl of lemon water to prevent the apples from browning.

In a medium, microwave safe mixing bowl melt 2 cups of the chocolate chips. (Save the remaining ½ cup for drizzling on top of the bark.) Melt the chocolate chips in the microwave heat for 30 seconds then stir well. Continue heating in 15 second increments until the chocolate is completely melted and smooth.

Pour melted chocolate onto the prepared baking sheet and spread evenly over the whole pan.

Top the chocolate with pretzels, pressing slightly into chocolate.

Drain the apples, then place on paper towels and pat dry with paper towels. Remove as much moisture as possible to prevent the chocolate from becoming runny and the pretzels soggy. Once dry set them aside.

In small microwave safe bowl, combine the caramels and 1 teaspoon of water. Heat for 30 seconds, then stir. Heat an additional 15 seconds and stir again. Continue heating for 15 seconds until caramels are melted and smooth. Slowly pour caramel over pretzel layer.

Place apples in a single layer over caramel and press gently into bark.

Heat remaining chocolate chips in bowl as you did in step two. Drizzle chocolate over top of the apple layer.

Refrigerate until bark is completely set. This could take several hours. Keep refrigerated until ready to eat. Cut with sharp knife.