Light and fluffy, filled with tangy lemon curd and topped with lemon buttercream icing, this 100% homemade dairy-free lemon cake is lemon heaven! Perfect for Mother's Day, Easter, birthdays, graduation parties or just because ... it's the perfect dessert for any occasion.
Preheat oven to 350 degrees F. Spray two 8-inch round cake pans with nonstick baking spray and line the bottoms of each with parchment paper.
Bowl 1 - In a large mixing bowl (note: everything will eventually be added to this bowl), combine the first 4 ingredients listed above – 3/4 cup of oil, 1 12/ cups of sugar, 1 Tbsp of lemon zest and 1 tsp of vanilla extract.
Bowl 2 - In a medium-sized bowl, mix your 2 dry ingredients – 2 cups of cake flour and 1 Tbsp of baking powder.
Bowl 3 - In your measuring cup or a small-medium bowl, mix the 1/3 cup of fresh lemon juice with the cold water.
Bowl 4 - In a stand mixer bowl (or a medium-large bowl if using an electric hand mixer), beat the 6 egg whites and 1/2 tsp salt to stiff peaks. Stiff peaks = they should appear glossy, smooth and firm and stand on their own without sliding off the whisk. Be careful not to over-mix or they will get grainy and break down.
Add your ingredients in bowls 2 and 3 to bowl 1 slowly, alternating in about 3 rounds of dry and wet ingredients to your main bowl. Mix well on low-medium speed with an electric hand mixer or whisk.
Finally, gently fold in the egg whites to your large bowl that now holds all your other ingredients mixed together. You want your egg whites evenly distributed and mixed into the batter, but be careful not to over-mix or mix your eggs whites in aggressively.
Bake 28-30 minutes at 350 degrees F.
Let cool for 10 minutes, then gently remove each cake from its pan and carefully place on a cooling rack to finish cooling.
Trim to flatten each round cake if needed, place on a cake stand (or large flat plate) then top the first cake with your lemon curd.
Carefully place the second cake layer on top of the lemon-curd topped cake and then frost the top and sides. It's ok (in my opinion) if some of the curd and icing mixes on the sides as you smooth it out.
(Optional) Add lemon zest and lemon slices on top to decorate.