Step 1

Warm the olive oil in a large skillet over medium heat. Once it’s shimmering, add the onion, bell pepper and 1/4 teaspoon of the salt. Cook, stirring often, until the onions and pepper are very tender, 6 to 8 minutes.

Step 2

Add the garlic, oregano, tarragon, and cinnamon. While stirring, cook until fragrant, about 1 minute. Add the tomatoes and cook for 1 minute, while stirring. Add the pumpkin purée and stir to combine. Continue simmering for 5 minutes, then remove it from the heat.

Step 3

Carefully transfer the mixture to your blender. Add 1 tablespoon butter and 1 teaspoon vinegar. Blend until very smooth and creamy.

Step 4

Season generously with freshly ground black pepper and additional salt (I usually add another 1/4 teaspoon salt). For a more luxurious sauce, add another tablespoon of butter, or for more tangy complexity, add another teaspoon of vinegar. Blend to combine.

Step 5

Stir into warm pasta. Serve with freshly grated Parmesan and chopped parsley on top.