Instructions: Bring a large pot of water to a boil. Meanwhile, using a sharp knife, chop sage and rosemary together into a thick paste; set aside. Remove the casings from the sausages, and knead them together by hand.

In a large saute pan wide and deep enough to hold all the ingredients, heat olive oil over medium heat. Add sausage, and cook, using a spatula to break up the sausage, until browned, about 5 minutes.

Add sage-and-rosemary mixture, 3/4 cup cream, and tomatoes to the sausage. Cook, stirring, 2 minutes. Add peas, and cook, 1 minute. Add butter, and gently stir until incorporated. Season with salt and pepper. Stir in Parmigiano-Reggiano cheese and the remaining 2 tablespoons heavy cream. Cook until heated through, about 1 minute.

Add salt and tagliatelle to the boiling water, and cook until done, 2 to 3 minutes. Drain pasta, and immediately add it to the sauce. Toss well to combine. Serve sprinkled with crushed red-pepper flakes.

This recipe yields 4 to 6 servings.

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