sourdough potato bread color experiments...

Fun with spuds! This idea had been playing around in my head for awhile, and when there were some beautiful purple fingerlings in a mixed bag I knew it was a sign that this 3-color potato bread needed making, in time to tweak a bit before Easter.
I started with the same potato/sweet potato bread used to make the hotdog buns -- by now a mere cousin of RLB's Bread Bible and blog version. I doubled the potato and used high-gluten flour in the main dough to compensate, and added some liquid starter for flavor and ease of shaping. (I don't use the milk powder or butter for allergy reasons.)

This makes one showy loaf  about 14 inches long but relatively flat, as braids go. (If you want a deeper/taller slice, you could rise and bake this in a pan, or make the ropes shorter and fatter.)
First the potatoes: boiled a regular (white) potato and the purple Vilotte (i think, they weren't labelled) fingerlings until tender, then drained and mashed. The sweet potato i cooked like i normally do: in the microwave, then mashed. I ended up with about 70-80 g of each.

Cooked and mashed potato varieties. They are in matchy bowls because i can. :D

 The sponge is mixed as normal and risen, using the potato cooking water. I then completed the dough as one, then divided it in three parts to knead in the colors of potatoes, but you might find it easier to divide the sponge into three bowls and add the other ingredients to form separate colored doughs.

The completed doughs -- kneading in the potato and oil or vegan butter. It's unintentionally a big smiley.

Shape each into a ball  then let rise covered until doubled. I put them right on a nonstick mat.

Before the first rise, and after the second.

Punch down and envelope fold, then rise another time; it should take about 45 minutes each time.

To shape, press one round into an oval, then roll up and pinch the seam so you have a tube with pointed ends, like a football... press out any big gas bubbles as you roll. Elongate the rope slightly, but keep the middle a bit thicker and the ends pointed. Do the same with the other two colors, lay them side by side, and start braiding from the middle.

Press the ends together and tuck them in. Flip the pan and braid the other end the opposite way, keeping the tension even... this keeps the shape consistent.

Cover (I use another pan to make sure there won't be sticking) and let the braid rise until it about doubles, about another 40 minutes. It should feel puffy, almost wobbly, when pressed with a fingertip.

Bake at 375 about 30 minutes. (I don't like eggwashing savory breads that don't have egg in them, especially ones that color well on their own, but you do you!)  It's done if you hear a hollow sound when tapping lightly underneath. 

Nicely colored! As you can see the white and purple strands broke a little as they rose and oven-sprang... 

The braid will have a crunchy crust when it comes out, but that will soften as it cools and the moisture distributes evenly.
My braid looked fine when it went into the oven, but as it rose and baked, the regular and purple ropes kind of fell out compared to the orange. It might be because of extra moisture from boiling, so next time I'll cook all the potato types by the same method and give up having cooking liquid in favor of ropes that keep their shape. (Of course, there will be an update when I accomplish that!)

Let the braid cool to the touch before you slice... even with the potato, it's a delicate crumb that will crush and gum up if it's too hot. But look how pretty!