>> source: Simply Recipes  
>> servings: 8  
>> time: 2 hours 15 minutes  

== Sauté the Mushrooms ==

Place @cremini mushrooms{680%g} roughly chopped and @shiitake mushrooms{225%g} roughly chopped in a #large sauté pan{} on high heat. Stir with a #wooden spoon{} from time to time.

Sprinkle @salt{2%g} over the mushrooms. They will release water (this is dry sautéing).

Once the mushrooms start to release water, stir in @onion{150%g} chopped. Cook until the mushroom water has boiled away, about ~{5%minutes} more.

== Make the Sauce ==

Add @extra virgin olive oil{60%ml} to the mushrooms and stir to coat. Sauté for about a minute, then add @garlic{4%cloves} chopped and cook for another minute.

Stir in @tomato paste{170%g} and cook for a minute. Reserve 240%ml of @tomato sauce{480%ml} for the bottom of the dish, and add the remaining 240%ml to the pot.

Add @crushed tomatoes{800%g} and @water{240%ml}.

Stir in @dried thyme{3%g}, @sugar{12%g}, and @red pepper flakes{1%g}. Bring to a simmer, lower the heat and simmer for ~{20%minutes}.

== Cook the Pasta ==

Preheat #oven{} to 175%C. Spread the reserved @tomato sauce{240%ml} over the bottom of a #large casserole dish{25x38 cm}.

Cook @lasagna sheets{450%g} in salted boiling water for ~{8%minutes} until al dente. Drain, rinse with cold water and lay on oiled #baking sheets{} to prevent sticking.

== Assemble the Lasagne ==

Thaw and squeeze excess moisture from @frozen chopped spinach{560%g} in a clean towel.

Layer lasagne over the sauce, slightly overlapping. Spread half the @ricotta cheese{425%g} over the lasagne, then half the spinach.

Sprinkle half the @mozzarella cheese{450%g} shredded and a quarter of the @pecorino cheese{115%g} shredded. Spoon a third of the mushroom sauce over the top. Scatter half the @fresh basil{15%g} chopped.

Repeat the layers: lasagne, remaining ricotta, remaining spinach, remaining mozzarella, another quarter of pecorino, another third of sauce, and remaining basil.

Add the final layer of lasagne, spread remaining sauce on top, and sprinkle with remaining pecorino.

== Bake ==

Cover with oiled aluminium foil and bake for ~{25%minutes}. Remove foil and bake uncovered for another ~{25%minutes}.

Let rest for ~{10%minutes} before cutting and serving.