pretty-colored potato rolls -- again.

We're almost at summer! So summer-colored bread buns. Also, potato hotdog buns (which, to be fair, are also great made into lobster rolls -- just split through the top rather than the side)... Partly inspired by the purple burger buns at Hapa, and my previous colored potato braid. Potato rolls are a classic for sandwiches because potato has a sort of timed-release moisture action in the baked bun, keeping it moist and soft but sturdy enough to stand up to loading with filling. These are not quite as smooth as Martin's, but they are tasty and a bit more complex in flavor because of the sourdough.  

The potatoes -- purple and Yukon gold, microwaved (most microwaves have a potato setting! If yours doesn't, one large or two smaller potatoes will take about 3 1/2 to 4 minutes on high), cooled, peeled and mashed. These are purple regular potatoes, not Okinawan sweet potatoes or Filipino ube. They're really deep purple!

Sourdough Potato Hotdog Buns (two-color version) makes 16 hotdog buns or 10 120 g burger buns
sponge: 
100 g. bread flour
90 g. water
20 g honey
8 g active dry or instant yeast
Beat together in the mixer bowl and let rise 1-4 hours, until puffed and bubbly. (if you're using instant yeast, you may want to add half now and the other half with the starter.)

Add and mix in with the hook:
320 g starter, fed 6-10 hours before
180 g bread flour
8 g salt 
20 g dry milk powder (optional)
(let rest 15-20 minutes to autolyse, if you wish. It's not essential, but it makes a smoother, more consistent dough.) Mix the dough again and divide it in half. 

175 g each mashed purple and Yukon gold potatoes (or 350 g of one kind)
30 g butter (or margarine, or coconut oil)

(Of course if you just want one color you'll skip the dividing and just mix the potatoes in with the whole batch.)

Add the potato to each half and mix it in with the butter (15 g or 1 tbsp for each part.) It might take a bit of kneading on the counter to get a uniform color, (I'm kind of disappointed the yellow is not that vibrant), round, then place in lightly buttered bowls and let rise until doubled, about 40 minutes to an hour.

Smileyfaces in the risen dough!

 Fold the edges in to de-gas, then turn each out.

Divide each into pieces about 38 g each, and fold to pre-shape. (The two in the middle will be single-color, so they're 75 g each.)

Roll into 6-inch ropes and twist. 

Lay them on a nonstick mat or parchment,

cover with a lid or plastic, and let rise... they may touch, but that's okay.
 

Bake at 350 about 20 minutes, until browned and sound hollow when tapped (the crust will be firm, but it softens as it cools). Pull them off the sheet and allow to cool on a rack so the bottoms don't get soggy.

The interior crumb.

Enjoy!