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1
Preheat the oven to 450F.
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2
Preheat a large skillet over medium-high heat with the 2 tablespoons of EVOO (twice around the pan) and the butter.
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3
Once the butter has melted, add the sausage, breaking it up with the back of a wooden spoon.
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4
While the sausage is starting to brown, cut the portobello mushroom in half and then thinly slice and add to the sausage.
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5
Chop and add to the pan as you go the onions, garlic, and rosemary.
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6
Season the sausage and mushrooms with the red pepper flakes, salt, and pepper.
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7
Once everything is in the pan, the sausage is lightly browned, and the mushrooms and onions have wilted, add the chicken stock and lemon juice.
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8
Continue to cook over high heat until the liquids have evaporated, about 2 to 3 minutes.
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9
While the sausage and mushrooms are cooking down in the liquid, in a bowl, combine the ricotta cheese with the egg, lemon zest, Parmigiano, and bread crumbs.
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10
Brush an 8-inch springform pan or an 8 x 8-inch baking dish with a little EVOO and place 7 disks of the polenta on the bottom of the dish.
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11
If they overlap a little thats fine; it will vary depending on what kind of dish you are using.
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12
Divide the sausage and mushroom mixture into 3 even portions.
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13
Do the same with the ricotta mixture.
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14
Using the back of a spoon, spread one third of the ricotta mixture on top of the polenta.
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15
Dont make yourself crazy doing thisjust mush it out over the polenta.
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16
Top the ricotta with one third of the sausage and mushrooms.
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17
Repeat the layers two more times, starting with the polenta and finishing with a sausage and mushroom layer.
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18
Sprinkle the top with the mozzarella.
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19
Cover the baking dish with aluminum foil, transfer to the oven, and bake for 15 to 18 minutes.
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20
To make sure it is cooked through, insert a knife into the center of the dish, wait a few seconds, and then remove it.
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21
Touch the knife with your fingertips and if it is hot, the lasagna is done.
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22
Remove from the springform (or cut loose from the baking dish) and serve.