Bring a large pot of salted water to a boil. Cook the pasta according to package directions. Drain, reserving 1/2 cup of the pasta water.
In an oven-safe skillet, heat 1 tablespoon olive oil. Brown the vegetarian/regular beef for 5-6 minutes, stirring occasionally. Stir in the garlic and shallot for 1-2 minutes. Swirl in the red pepper flakes, tomato paste and butter, then pour in the vodka. Simmer 2-3 minutes until reduced, stirring. Add the heavy cream and simmer 8-10 minutes until slightly thickened. Season with salt and pepper to taste. If needed, transfer to an oven-safe pan or dish.
In a bowl, stir together the ricotta, pesto, 1 cup of mozzarella, and the parmesan cheese.
Stuff each shell with 1 tablespoon of the ricotta filling and arrange in the skillet. Repeat until all shells/filling are used up. Bake 12-15 minutes until the cheesy is gooey and melted, Top with fresh basil and serve hot!