Preheat the oven to 350.
Bring eggs to room temperature by placing them in a bowl of warm water for 10 mins. In a large bowl combine flour, sugar, salt, and baking soda.
In a separate bowl add orange juice, egg yolks, oil, and zest. Whisk together. Pour the wet ingredient mixture into the dry and whisk until incorporated.
In a clean, oil-free glass bowl beat egg whites and cream of tartar on high speed until stiff peaks form.
Fold egg whites into the batter until no streaks are there.
Lightly grease only the bottom on the tube pan or 2 nine-inch pans.
Carefully and gently spoon the batter into the pan(s).
Drag a butter knife through the batter to release any air pockets and bake for 45-50 mins. You will know it’s done when the top springs back when lightly touched.
Gently set the cake (still in the pan) on a wire rack to cool completely (40-50 mins)
Gently glide a knife around the sides and center of the pan to release the cake. Place serving plate on top of the pan and flip the cake over.
Glaze for cake in a tube pan
Melt the butter in a small saucepan.
Whisk in the confectioner's sugar, orange juice, and zest until smooth.
Pour or spoon over the top of the cake allow it to drizzle down the sides.
Frosting for layer cake
Mix powdered sugar, butter, cream, and half the orange juice.
Add more orange juice only if necessary.
Mix on high for 5-7 mins until light and fluffy.
Spread between the layers.
Add remaining frosting to a piping bag or ziplock bag.
Dust the cake with powdered sugar
Squeeze out dollops of icing around the top of the cake.
Serve and enjoy!