Preheat oven to 350°F and line two cookie sheets with parchment paper.
Cream together butter and sugar, then add in whole eggs, vanilla and Cara Cara orange juice until well blended.
Mix in salt, baking soda, baking powder and all-purpose flour until well combined.
Place large circular spoonfuls (about 1-1/2" across) on the parchment paper lined cookie sheets, seperating them by about 2" as they will spread.
Bake for 15 minutes or until lightly browned. Allow cookies to cool before assembly.
In a stand mixer, combine egg white and cream of tartar. Set mixer on low and allow it to beat while you are working on the sugar mixture.
Select two similarly sized cookies and place a 2 tbsp dollop of filling on one cookie. Place the second cookie on top and swirl it around while pressing down to distribute the filling evenly in between the cookies.
Serving Size 1