1tspcoarse Kosher salt(if using table salt, use half the amount)
2 ½cupswhole buttermilk,room temperature
Buttercream
2cupsunsalted butter,softened to room temperature
4cupspowdered sugar
1tbspmeringue powder
¼tspcoarse Kosher salt(if using table salt, use half the amount)
2tspvanilla extract
2tspalmond extract
2-4tbspwhole milk
Instructions
Cake
Preheat the oven to 350 F, and spray the bottoms of your cake pans with non-stick spray.For the tiered cake shown in this post, you'll need two 8-inch pans and two 6-inch pans. Alternatively, you can bake this cake in three 8-inch cake pans for a single-tiered cake.
In the bowl of your stand mixer fitted with the paddle attachment, beat the butter and sugar for 10 minutes on medium speed (#6 on a Kitchen Aid mixer), scraping the bowl occasionally.
Beat in the vanilla and almond extracts.
Beat in the egg whites, one at a time, beating each for 10 seconds before adding the next. Scrape the bowl down and beat for 10 more seconds.
In a separate bowl, sift together the cake flour, baking powder and salt.
With the mixer on low, add the flour mixture in three additions, alternating with the buttermilk, starting and ending with the flour. Use a spatula to scrape the bowl well and incorporate any stray bits of flour.
Divide the batter between the pans. You should divide the batter by scooping 2 cups into each of the 8-inch pans, 1 cup into each of the 6-inch pans, and then evenly dividing any leftover batter between the four pans.Bake on the center oven rack for about 25-30 minutes, until a cake tester or toothpick comes out clean.
Set the pans on a wire rack, cover loosely with a clean kitchen towel, and cool completely before frosting.
Buttercream
In the bowl of your stand mixer fitted with the whisk attachment, beat the butter for 1 minute until smooth.
With the mixer on low, add the powdered sugar, meringue powder and salt and mix until combined.
Add the vanilla, almond extract and milk (as needed for desired consistency), increase the speed to medium (#4/6 on a Kitchen Aid Mixer) and whip for 4-5 minutes, scraping the bowl occasionally, until very light and fluffy.
Assembly
Carefully remove the cooled cakes from the pans. Place one of the 8-inch cakes on a cake board. It's helpful to use a cake decorating turn table for assembling and frosting your cake.Frost the top of the cake with a layer of buttercream. Top with the 2nd 8-inch cake and frost all over with a very thin "crumb coat" of buttercream.
Center one of the 6-inch cakes on top. (There's no need to use dowels or supports, since this is a pretty petite cake as far as tiered cakes go.)Frost the top of the cake with a layer of buttercream. Top with the 2nd 6-inch cake and frost all over with a very thin "crumb coat" of buttercream.
Place the crumb-coated cake in the refrigerator to chill for 30 minutes.
Frost the cake all over with a pretty, swirly layer of buttercream. It doesn't need to look perfect - the random swoops and swirls are what make this cake so gorgeous.
Notes
Optional:
Using all butter in the buttercream will make an ivory buttercream. If you want a brighter white buttercream (as pictured in this post), substitute vegetable shortening for half of the butter.
For even more almond flavor and a little crunch, try adding a handful of finely chopped almonds in between each layer of cake.
To make the white chocolate rose, see this video tutorial by Ann Reardon. Place the rose on the cake before the buttercream crusts over, so that the buttercream acts as "glue" to adhere the flower.
If placing real flowers on your cake, be sure they are clean, non-toxic and pesticide free. Wrap the stems in floral tape before inserting them into your cake.
Storage and Making Ahead:
Leftover cake should be stored in an airtight container or cake carrier for up to 3 days.
If baking, decorating and assembling the cake in advance, place the entire assembled cake in a cake box or airtight cake carrier. Freeze for up to 2 weeks.
Sea Level Ingredient Adjustments (tested by a baker in Ohio):