1Make ricotta cheese: In a saucepan, combine milk, heavy cream, and salt. Heat gently over medium-low heat, stirring frequently, to 190°F/88C. Remove from heat, stir in vinegar, and let sit for 15 minutes.
2Make ricotta cheese: In a saucepan, combine milk, heavy cream, and salt. Heat gently over medium-low heat, stirring frequently, to 190°F/88C. Remove from heat, stir in vinegar, and let sit for 15 minutes.
3Make ricotta cheese: In a saucepan, combine milk, heavy cream, and salt. Heat gently over medium-low heat, stirring frequently, to 190°F/88C. Remove from heat, stir in vinegar, and let sit for 15 minutes.
4Cook pasta shells in salted boiling water until almost al dente, about 6 minutes. Drain and toss with olive oil.
5Cook pasta shells in salted boiling water until almost al dente, about 6 minutes. Drain and toss with olive oil.
6Cook pasta shells in salted boiling water until almost al dente, about 6 minutes. Drain and toss with olive oil.
7Prepare the filling: Stack prosciutto slices, and mince into small pieces. Fry in olive oil in Dutch oven for 90 seconds. Add garlic and cook for 1 minute, then stir in spinach until wilted.
8Prepare the filling: Stack prosciutto slices, and mince into small pieces. Fry in olive oil in Dutch oven for 90 seconds. Add garlic and cook for 1 minute, then stir in spinach until wilted.
9Prepare the filling: Stack prosciutto slices, and mince into small pieces. Fry in olive oil in Dutch oven for 90 seconds. Add garlic and cook for 1 minute, then stir in spinach until wilted.
10Prepare the marinara sauce: In the Dutch oven, saute grated onion and garlic for 5 minutes. Stir in the Calabrian chiles and cook for 2-3 minutes.
11Prepare the marinara sauce: In the Dutch oven, saute grated onion and garlic for 5 minutes. Stir in the Calabrian chiles and cook for 2-3 minutes.
12Prepare the marinara sauce: In the Dutch oven, saute grated onion and garlic for 5 minutes. Stir in the Calabrian chiles and cook for 2-3 minutes.
13Add tomato paste and cook for 1 minute. Add crushed tomatoes, salt, sugar, water, and simmer for 5 minutes. Stir in basil and taste.
14Add tomato paste and cook for 1 minute. Add crushed tomatoes, salt, sugar, water, and simmer for 5 minutes. Stir in basil and taste.
15Add tomato paste and cook for 1 minute. Add crushed tomatoes, salt, sugar, water, and simmer for 5 minutes. Stir in basil and taste.
16Combine the ricotta, prosciutto-spinach mixture, heavy cream, mozzarella, parmesan, pepper, and egg in a medium bowl. Stir well to combine.
17Combine the ricotta, prosciutto-spinach mixture, heavy cream, mozzarella, parmesan, pepper, and egg in a medium bowl. Stir well to combine.
18Combine the ricotta, prosciutto-spinach mixture, heavy cream, mozzarella, parmesan, pepper, and egg in a medium bowl. Stir well to combine.
19Preheat the oven to 425°F/220C. Fill each pasta shell with the ricotta mixture and place in a Dutch oven with the marinara sauce.
20Preheat the oven to 425°F/220C. Fill each pasta shell with the ricotta mixture and place in a Dutch oven with the marinara sauce.
21Preheat the oven to 425°F/220C. Fill each pasta shell with the ricotta mixture and place in a Dutch oven with the marinara sauce.
22Sprinkle parmesan cheese over the stuffed shells. Cover the Dutch oven with a lid and bake for 15 minutes.
23Sprinkle parmesan cheese over the stuffed shells. Cover the Dutch oven with a lid and bake for 15 minutes.
24Sprinkle parmesan cheese over the stuffed shells. Cover the Dutch oven with a lid and bake for 15 minutes.
25Remove the lid and bake for another 15 minutes to brown the cheese.
26Remove the lid and bake for another 15 minutes to brown the cheese.
27Remove the lid and bake for another 15 minutes to brown the cheese.
28Serve the stuffed shells topped with extra parmesan and a drizzle of spicy olive oil.
29Serve the stuffed shells topped with extra parmesan and a drizzle of spicy olive oil.
30Serve the stuffed shells topped with extra parmesan and a drizzle of spicy olive oil.