Cook the Aromatics: In a large pot over medium-high heat, add the sun-dried tomatoes along with a bit of their oil and the chopped onion. Stir occasionally and cook for a few minutes until the onion starts to soften.
Add Garlic and Herbs: Add the minced garlic, dried basil, dried thyme, and dried oregano to the pot. Stir to combine and cook for another 2-3 minutes until fragrant.
Incorporate the Purees: Stir in the pumpkin puree and tomato puree, mixing well to combine.
Simmer the Sauce: Add the salt, pepper, vegetable broth, and coconut milk to the pot. Stir everything together and bring the sauce to a boil. Reduce the heat and let it simmer for about 15 minutes, stirring occasionally. If the sauce becomes too thick, add a bit of water to reach your desired consistency.
Blend the Sauce: Remove the sauce from the heat. Using a handheld immersion blender, puree the sauce directly in the pot until smooth. If you don’t have an immersion blender, transfer the sauce to a regular blender and puree until smooth, then return it to the pot.