Purple Sweet Potato Cake

Pink Birthday CakeOne would think that if you roast purple sweet potatoes until soft and tender, blend them into a silky smooth puree and bake them in a cake, that said cake would emerge from the oven a delightful violet color, or maybe a purply pink.  But one would be wrong.

In fact, while the cake batter went into the oven purple, the baked cakes emerged a bizarre green color.  I'm no scientist, but I'm guessing there was some sort of oxidation effect during the baking process that was to blame... 

Doesn't the opposite happen when you boil artichokes, and the cooking liquid turns bluish-purple?  And did you also know that when making natural dyes for Easter eggs, the skin of a red onion will dye an eggshell green as well?  There's also a strange trick that some people use to whiten buttercream that's too yellow - a tiny drop of purple food coloring neutralizes the yellow color of the butter and whitens the frosting.  I wonder if Alton Brown ever discussed these phenomenons on any of the old episodes of Good Eats.  I sure miss that show.

Some things just don't work out the way you expect, but at least I learned from it, and now you have learned from my experiment as well.  The cake actually tasted very nice, so the recipe testing itself was productive, I just don't think anyone wants to eat cake the color of mold.  I had lots of the purple sweet potato puree on hand after this experiment, but happily, it's not going to waste, as it turns out that our baby boy loves purple sweet potatoes, so into the baby food freezer molds it went.

In spite of the color mishap, the exterior of the cake looked pretty though, with the buttercream tinted from more of the roasted purple sweet potatoes, and topped with tall, sparkly pink candles I bought from Shop Sweet Lulu.  Come to think of it, the cake forks and cake stand were from Shop Sweet Lulu, too.  I wonder if I shop there too often...




Pink Birthday Cake

Pink Birthday Cake

Pink Birthday Cake

Pink Birthday Cake

Pink Birthday Cake

1 comment :

  1. What a amazing look of the cake in purple color. Wow! I really love it when i saw the pictures of that cake. Now here you wrote the complete recipe to make similar cake at home. Just need to follow the above instructions. However, I want essayshark writing service review but the whole website is all about the cakes. Thanks for this cakes collection.

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