Mango Tartlets with Lime Curd and Tropical Nut Crust

Preheat oven to 350 °F. Spray eight 4-inch-diameter tartlet pans with removable bottoms with vegetable oil spray. Combine macadamia nuts, coconut, pistachios and brown sugar in processor. Process until nuts are finely chopped. Transfer to large bowl. Beat egg whites in another large bowl until soft peaks form. Fold whites into nut mixture in 3 additions (mixture will be thick and sticky). Let mixture stand 10 minutes. Using plastic wrap as aid, press about 1/3 cup nut mixture onto bottoms and up sides of each prepared pan. Place pans on baking sheet. Bake until crusts are puffed and begin to brown, about 20 minutes. Cool crusts in pans 5 minutes. Using oven mitt, gently remove pan sides; cool crusts completely on rack.