Line a 10" x 10" pan with parchment paper extending over the edges so the candy may be easily removed after it cools. Alternatively use a quarter-sheet pan and line with a heat-resistant silicone mat or parchment paper. Lightly spray with cooking oil.
Place eggs whites and salt in the mixing bowl of a stand mixer fitted with the whisk attachment (a hand mixer may also be used). Begin whipping egg whites until they reach stiff, glossy peaks. Turn off mixer.
Place sugar, corn syrup and water in a 3-quart saucepan. Stir to combine.
Begin heating over medium heat stirring occasionally. Stop stirring when mixture begins to boil.
Insert a candy thermometer into the pan making sure the thermometer does not touch the bottom of the pan.
Continue heating until the temperature reaches 260° F (125° C).
Turn on mixer to medium-low (the whipped egg whites should still be in the bowl). Carefully begin pouring the hot sugar mixture down the side of the mixing bowl while the mixer is running. Pour in a slow steady stream (over approximately a one minute time frame).
After the sugar syrup is added to the mixing bowl, turn up the speed to medium-high and continue to whip. The mixture will begin to loose it's glossiness - continue to mix for 5 minutes or until bowl is just slightly warm to the touch.
Working quickly, fold in the pistachios and dried cherries.
Pour the mixture into your prepared pan. Press the divinity evenly into the pan using your hands or an offset spatula sprayed with vegetable oil.
Allow to rest for 1 hour before unmolding and cutting into desired pieces.
Divinity should be stored in an airtight container for up to 5 days.