You'll love this classic Italian cookie, Brutti ma Buoni, which literally translates for "ugly but good" because of its cracked appearance. The light and airy cookies have a meringue-like texture and a delicious crunch from the hazelnuts.
Preheat oven to 300 degrees. Line two baking sheets with parchment paper; set aside.
In a food processor fitted with the blade attachment, pulse the hazelnuts until they are roughly chopped. Alternatively, you can chop these using a kitchen knife. You want the hazelnuts coarsely chopped and irregular in size; set aside.
In a large bowl, combine the egg whites, cream of tartar, and salt. Use an electric mixer to beat until foamy. Then, gradually beat in the sugar until the egg mixture has a meringue consistency and forms stiff peaks. Fold in the hazelnuts.
Transfer the mixture to a medium stainless steel saucepan. Cook on low heat, stirring consistently with a wooden spoon, until the mixture is amber/golden in color; about 10 minutes.
Remove the mixture from the heat and use a cookie scoop or spoon to quickly scoop out equal portions of cookie dough on to the prepared baking sheets (you should be able to fit a dozen cookies per pan).
Place the cookies in the preheated oven, rotating halfway through, until the cookies have dried out on top; about 25 minutes. Remove from oven and let the cookies cool on the baking sheet and then use a spatula to remove to a wire rack to cool completely.
Notes
Hazelnuts: easily remove the skin from your hazelnuts by placing them in on a baking sheet in a 350 degree oven for 8-10. While the nuts are still warm, place them inside a clean tea towel. Gather the towel into a secure bundle and roll the nuts in a circular motion to loosen and remove some of the skins. Cream of Tartar: the cream of tartar is used to stabilize the egg whites. If you don't have any, you can use ¼ teaspoon of lemon juice instead. Saucepan: use a stainless steel pan to cook the meringue for best results. Also, make sure you are stirring the meringue constantly using a wooden spoon for best results. Storage: store leftover cookies in an airtight container in a cool dry place.