Preheat oven to 350F.
Lay parchment circle on the bottom of the two 8” round cake pans, grease and set aside.
Stir flour, baking powder, baking soda, salt, lime zest for cake and set aside.
In a large mixing bowl, beat shortening and 2 egg yolks with an electric mixer at high speed for about 3-5 minutes until light in color and increased in volume.
Add sugar and vanilla and beat for 1 minute until well combined
Beat egg whites individually into the cake batter.
Add flour mixture and buttermilk in half alternating portions, add lime juice and beat on low speed until just combined.
Pour cake batter into greased pans.
Bake for 30 minutes or until toothpick comes out clean.
Cool cake to room temperature before assembly.