rather than cooking onions separately for the filling, we incorporate some of the caramelized onions used to garnish the dumplings.
1/4 cup reserved chopped caramelized onions (see step 3 of polish dumplings, related)
mix all of the ingredients together in a medium bowl until uniformly combined. use right away to fill pierogi or cover with plastic wrap and refrigerate until needed, but no longer than 2 days.
rather than cooking onions separately for the filling, we incorporate some of the caramelized onions used to garnish the dumplings.
1/4 cup reserved chopped caramelized onions (see step 3 of polish dumplings, related)
1. pulse the white mushrooms in a food processor until finely chopped, about 15 pulses; transfer to a bowl and set aside. melt the butter in a 12-inch nonstick skillet over medium heat until shimmering. add the garlic and cook until fragrant, about 30 seconds. stir in the processed mushrooms, porcini mushrooms, and 1/4 tsp salt. cover, turn the heat to medium-low, and cook, stirring occasionally, until the mushrooms are wet and wilted, about 7 minutes.
2. uncover, increase the heat to medium-high heat, and continue to cook until the mushroom liquid has evaporated and the mixture clumps and is starting to brown, about 7 minutes.
3. add the reserved chopped caramelized onions. stir in the sour cream and cook until the mixture is sticky and cohesive but not wet, about 30 seconds. transfer the mixture to a bowl; cool slightly. stir in the parsley and season with salt and pepper to taste before filling the pierogi or cover with plastic wrap and refrigerate until needed, but no longer than 2 days.
while we prefer the flavor and texture of farmer's cheese here, an equal amount of ricotta cheese can be substituted. use either a food mill or a ricer to process the cooked potatoes for the filling; do not use a food processor or the filling will have a gummy texture. rather than cooking onions separately for the filling, we incorporate some of the caramelized onions used to garnish the dumplings.
1/4 cup reserved chopped caramelized onions (see step 3 of polish dumplings, related)
1. cover the potatoes by 1 inch of water in a large saucepan and add 1 tbsp salt. bring to a boil, then reduce to a simmer and cook until the potatoes are tender and a fork can be slipped easily into the center, 10 to 12 minutes. drain the potatoes into a colander.
2. set a food mill or ricer over a medium bowl and process the potatoes into the bowl. add the caramelized onions. stir in the cheeses and butter until incorporated and season with
salt and pepper to taste. cool slightly before filling the pierogi or cover with plastic wrap and refrigerate until needed, but no longer than 2 days.