Preheat oven to 350 degrees. Line a large baking sheet with parchment paper.
In a large bowl, whisk together the egg whites, cayenne pepper, coconut palm sugar and salt. Add the nuts and toss to coat evenly in the seasoned egg mixture.
Spread the nuts out on an even layer on the parchment-lined baking sheet. Bake for 20 minutes. Add the dried pineapple or mango (or both) and the rosemary. Return the nuts to the oven and bake 5 more minutes. Remove nuts from oven and set aside to cool for at least 10 minutes before serving. (Note: Party nuts can be made up to 1 month in advance and stored in the freezer in an air tight container.)
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