A German onion and potato pie, traditionally served with Federweisser. This regional variety of Zwiebelkuchen is from the Black Forest. It adds bacon, and is baked in a deep, round dish.
Dissolve the yeast in the warm milk and let hydrate for 5 minutes. Whisk together the 1/2 tsp. of the salt and 215g of the flour flour in a large bowl. Form a well in the center of the flour and add 4 Tbsp. of the butter and milk. Mix together until a rough dough comes together, then transfer to a floured work surface and knead until elastic and smooth. Form into a ball, transfer to a lightly oiled proofing bowl, cover, and let rise until doubled.
Fry the bacon in a large pan until cooked. Add onions along with remaining butter. Reduce heat to low and slowly cook the onions until caramelized. Remove from heat and let cool.
Combine the sour cream, eggs, remaining 2 Tbsp. of, remaining 2 tsp. salt, caraway seeds, and ground pepper in a mixing bowl. Add the onion mixture and stir to thoroughly incorporate.
Preheat oven to 400°F and butter a 9" diameter springform pan. Deflate the dough and transfer to the pan, spreading to evenly cover the bottom and up the sides. Pour the onion mixture in and transfer to the oven.
Bake until the top is light brown and the center of the pie is fairly firm to the touch.
Let cool at least 20 minutes before serving, either at room temperature of chilled.
Made this with maple smoke bacon. I accidentally left it in the oven for an additional ~20 minutes which caused it to darken on top and rise much quite a bit, but thankfully did not burn nor get dry. In fact, this is incredible. The crust is robust and I think goes very well with the sweat and savory filling.
Made this with approximate measurements (didn't have a scale with me), and added ~12 oz. of shiitake mushrooms that had been cooked first. I must have done something incorrect when making the dough as it was very very dry (read: just a bowl of flour) after I had added all the ingredients for it. I ended up adding an additional ~1/2 c. of water to get it to a barely workable consistency, which was still very dense. It didn't rise much at all, and once cooked was very hard. Even though the crust was a flop, this is still delicious.