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2 tablespoons olive oil
2 lbs fresh white mushrooms, finely chopped
2 pinches salt
2 tablespoons butter
1 cup finely chopped onion
8 cloves garlic, minced
1 cup quick-cooking oats
2 ounces very finely shredded
Parmigiano-Reggiano cheese
1 cup bread crumbs
1/2 cup chopped flat-leaf (Italian) parsley,
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packed
4 eggs, divided
2 teaspoons salt
freshly ground black pepper to taste
2 pinches cayenne pepper, or to taste
2 pinches dried oregano
6 cups pasta sauce
2 tablespoons very finely shredded
Parmigiano-Reggiano cheese, or to taste
2 tablespoons chopped flat-leaf (Italian)
parsley, or to taste
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1. | Heat olive oil in a skillet over medium-high heat. Add mushrooms to the hot oil, sprinkle with salt, and cook and stir until liquid from mushrooms has evaporated. Stir butter into mushrooms, reduce heat to medium, and cook and stir mushrooms until golden brown, about 5 minutes.
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2. | Stir onion into mushrooms and cook, stirring often, until onion is translucent, 5 minutes. Remove skillet from heat and stir garlic into mushroom mixture until fragrant, about 1 minute. Transfer mixture to a mixing bowl.
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3. | Mix oats into mushroom mixture until thoroughly combined. Gently stir 1 ounce Parmigiano-Reggiano cheese into mixture. Add bread crumbs, 1/4 cup parsley, and 1 egg; season with salt, black pepper, cayenne pepper, and oregano. Mix together with a fork until crumbly. Stir in remaining 1 egg. Mixture should hold together when pressed.
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4. | Cover bowl with plastic wrap and refrigerate at least 4 hours. For best flavor and texture, refrigerate overnight.
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