Mushroom-filled pasta pairs nicely with creamy sauces, or a simple tomato-based sauce.
Rinse and soak in hot water to cover until softened, about 20 minutes:
Heat in a large skillet over medium heat:
Add and cook, stirring, until the onion is browned:
Lift the mushrooms from the soaking liquid, reserving the liquid, squeeze dry, and finely chop. Add the mushrooms to the skillet along with:
Cook the mushrooms, stirring, for 2 minutes. Add:
Bring to a boil and cook until the pan is almost dry. Line a fine-mesh sieve with dampened paper towels and pour the mushroom soaking liquid through the sieve directly into the skillet. Let it boil until evaporated. Add and let boil until evaporated:
Season to taste with:
Remove from the heat and let cool; remove and discard the bay leaves. Blend in:
The filling can be covered and refrigerated for up to 3 days.