1Sauté the finely chopped onion for a few minutes with salt and pepper.
2Sauté the finely chopped onion for a few minutes with salt and pepper.
3Sauté the finely chopped onion for a few minutes with salt and pepper.
4Add the minced garlic and cook for 30 seconds, then add the chopped spinach.
5Add the minced garlic and cook for 30 seconds, then add the chopped spinach.
6Add the minced garlic and cook for 30 seconds, then add the chopped spinach.
7Season again with salt and squeeze in the juice from half a lemon.
8Season again with salt and squeeze in the juice from half a lemon.
9Season again with salt and squeeze in the juice from half a lemon.
10Let the spinach wilt and then set aside, making sure to squeeze out as much water as possible.
11Let the spinach wilt and then set aside, making sure to squeeze out as much water as possible.
12Let the spinach wilt and then set aside, making sure to squeeze out as much water as possible.
13To make the marinara, heat about 1/4 cup of olive oil in a clean pan over medium/low heat.
14To make the marinara, heat about 1/4 cup of olive oil in a clean pan over medium/low heat.
15To make the marinara, heat about 1/4 cup of olive oil in a clean pan over medium/low heat.
16Add the sliced garlic, basil leaves, and Calabrian chilies, and let them sizzle for a couple of minutes.
17Add the sliced garlic, basil leaves, and Calabrian chilies, and let them sizzle for a couple of minutes.
18Add the sliced garlic, basil leaves, and Calabrian chilies, and let them sizzle for a couple of minutes.
19Pour in the crushed tomatoes, season with salt and pepper, and let it simmer.
20Pour in the crushed tomatoes, season with salt and pepper, and let it simmer.
21Pour in the crushed tomatoes, season with salt and pepper, and let it simmer.
22Cook the pasta shells to al dente, drain, and set aside.
23Cook the pasta shells to al dente, drain, and set aside.
24Cook the pasta shells to al dente, drain, and set aside.
25Combine ricotta, mozzarella, Parmesan, cooked spinach, fresh basil, fresh parsley, salt, pepper, red pepper flakes, lemon zest, nutmeg, and an egg in a bowl.
26Combine ricotta, mozzarella, Parmesan, cooked spinach, fresh basil, fresh parsley, salt, pepper, red pepper flakes, lemon zest, nutmeg, and an egg in a bowl.
27Combine ricotta, mozzarella, Parmesan, cooked spinach, fresh basil, fresh parsley, salt, pepper, red pepper flakes, lemon zest, nutmeg, and an egg in a bowl.
28Stir to combine the filling ingredients and set aside.
29Stir to combine the filling ingredients and set aside.
30Stir to combine the filling ingredients and set aside.
31Add a thin layer of marinara sauce to the bottom of a baking dish.
32Add a thin layer of marinara sauce to the bottom of a baking dish.
33Add a thin layer of marinara sauce to the bottom of a baking dish.
34Stuff each pasta shell with about 2 to 3 tablespoons of the ricotta filling.
35Stuff each pasta shell with about 2 to 3 tablespoons of the ricotta filling.
36Stuff each pasta shell with about 2 to 3 tablespoons of the ricotta filling.
37Arrange the stuffed shells in the baking dish and dollop in any leftover ricotta filling.
38Arrange the stuffed shells in the baking dish and dollop in any leftover ricotta filling.
39Arrange the stuffed shells in the baking dish and dollop in any leftover ricotta filling.
40Pour the tomato sauce directly on top of the shells.
41Pour the tomato sauce directly on top of the shells.
42Pour the tomato sauce directly on top of the shells.
43Finish with a layer of mozzarella and Parmesan cheese.
44Finish with a layer of mozzarella and Parmesan cheese.
45Finish with a layer of mozzarella and Parmesan cheese.
46Cover the dish with foil and bake at 350°F for 20 minutes.
47Cover the dish with foil and bake at 350°F for 20 minutes.
48Cover the dish with foil and bake at 350°F for 20 minutes.
49Remove the foil and finish under the broiler until golden and bubbly.
50Remove the foil and finish under the broiler until golden and bubbly.
51Remove the foil and finish under the broiler until golden and bubbly.