To prepare a tenderstem and cambozola tartlet recipe, first you need to prepare the ingredients. First, you'll need the following ingredients: 2 tablespoons butter, 2 teaspoons kosher salt, 1/2 teaspoon cayenne pepper, and 1 teaspoon thyme. You can find these ingredients at most grocery stores. Then, preheat the oven to 375 degrees F (190 degrees C) and prepare your oven rack to line the bottom of the tart pan with parchment paper. Set aside. In the bowl of an electric mixer, beat the egg whites on medium speed until stiff peaks form. Gradually add the sugar, beating well after each addition. Add the vanilla and salt and beat until the mixture is light and fluffy, about 2 minutes. Pour the batter into the prepared tart shell and bake for 20 minutes or until golden brown.