Sweet Potato Cake with Marshmallow Frosting
Sweet potatoes during Thanksgiving has always been a staple at dinner, and once I came across this recipe I knew I had to make it. Not only did it look delicious but it gave me the chance to pull out my blowtorch and light some food on "almost fire". Sweet potatoes are pretty sweet as they are, hence the name, and there was only a little bit of sugar in the cake. Other than roasting the potatoes in the oven for about an hour, the rest of the cake didn't take long to assemble. This cake was made in a square pan, but I would even try making individual cakes using cupcake pans. The recipe was fairly easy to make and the instructions were simple to follow. So if you like sweet potato's with marshmallow I would try this different take on it.
I made this recipe twice in one week! My club was making this so I had to test it out before hand to make sure I knew what the heck I was doing, and second to make sure it looked as good as it tasted. The first time the cake rose a lot so I cut off the top to give a level surface for the frosting. Everything was pretty successful each time, but I definitely got more excited with the torch the second time around. All the photos are either from the first or second time, just if you were wondering why the cakes looked different.
Serves 16 in approximately 2-inch squares
What you need:
Cake 1 1/2 pounds sweet potatoes (about 2 to 3 medium or 2 large) 2 cups (250 grams) all-purpose flour 1 3/4 teaspoons baking powder 1/2 teaspoon baking soda 1/2 teaspoon table salt 1 teaspoon ground cinnamon 1/4 teaspoon (more to taste) ground ginger Two pinches (more to taste) ground cloves 1/2 cup (1 stick or 115 grams) unsalted butter, at room temperature 1 cup (190 grams) packed light brown sugar 1/2 teaspoon vanilla extract 2 large eggs
Frosting 3 large egg whites 3/4 cup granulated sugar Pinch of salt 1/4 teaspoon cream of tartar (will help stabilize egg whites, don’t worry if you don’t have it) 1/2 teaspoon vanilla extract
Roast sweet potatoes: Heat oven to 375 degrees. Prick potatoes all over with a fork. Rest on a baking sheet. Roast for 45 minutes to 1 hour, turning once or twice, until soft. Let cool completely. Can be kept in fridge for up to 3 days, if baked in advance.*
Make cake: Heat oven to 350 degrees F. Line the bottom of an 8- to 9-inch square pan with parchment paper, then butter the paper and sides of the pan. [If you trust your nonstick pan, you might be able to skip the parchment, but I don’t like to live on the edge when it comes to getting cakes out of a pan.]
Peel cooled sweet potatoes and run flesh through a potato ricer, or mash until very smooth. (Do not blend in a blender or food processor.) Measure 1 1/2 packed cups (about 12 to 13 ounces) from sweet potato mash; you may have a little extra.
Whisk flour, baking powder, baking soda, salt and spices together in a medium bowl. In a large bowl, beat butter and brown sugar together with an electric mixer until light and fluffy, about 2 to 3 minutes. Add vanilla and eggs, and beat until just combined. Mix in sweet potato puree, then stir in dry ingredients just until they disappear.
Spread batter in prepared pan, and bake cake until a toothpick inserted into the center comes out clean, about 35 to 40 minutes. Let cake rest in pan for 5 minutes on a cooling rack, then invert onto cooling rack, and let cool completely. You can speed this up in the fridge.
Make frosting: Place egg whites, granulated sugar, a pinch of salt and cream of tartar in a heatproof bowl set over a saucepan of gently simmering water. Whisk mixture for 3 minutes, until whites are warmed and sugar granules feels mostly dissolved. Remove bowl from top of saucepan, then, with an electric mixer, beat egg white mixture on high speed until stiff, glossy peaks form, about 4 to 7 minutes longer. Add vanilla and mix until combined.
Frost and decorate: If you’d like to make huge, marshmallow-like dollops, spread a bit of frosting thinly over cooled sweet potato cake. Then, using a very large round piping tip (I have an almost comically large one with a 1/2-inch opening) or the corner snipped off a freezer bag, pipe large dollops of frosting all over thin frosting layer. If you’d like to skip the dollops, you can just spread the frosting, thick and swirly, all over.
Using a kitchen torch, lightly brown the dollops so that they look (and smell!) like toasted marshmallows. **
Serve: At room temperature cut into squares. Cake keeps at room temperature for two days; any longer, I like to keep it in the fridge.
*I would make it in advance because it does take up a lot of time
** This is obviously the best part, saving the best part for last!
Recipe from: Smitten Kitchen, Sweet Potato Cake with Marshmallow Frosting