Spring In Bloom Layer Cake

granulated sugar ((1 1/2 cups))

cake flour ((3 cups))

baking powder

baking soda

salt

whole eggs (at room temperature)

sour cream (at room temperature)

vanilla extract

unsalted butter (at room temperature)

pasteurized liquid egg whites ((1 cup))

powdered sugar ((8 cups))

salt

unsalted butter (at room temperature)

vanilla extract

Assorted gel food coloring

prepared lemon curd

raspberry jam ((the stiffer the better—do not use a very loose jam))