In a large pot on medium-high heat, add coconut oil.Once melted and heated, add onion, sauteeing for about 5-8 minutes, until translucent and fragrant.Add curry paste, coriander, cumin, and garlic, sauteeing for an additional 2 minutes.Add pumpkin puree and vegetable broth, cooking for an additional 10 minutes.Add lime juice, season to taste, and puree soup with an immersion blender, until smooth.Serve soup with a few generous spoonfuls of coconut milk, and a handful of fresh cilantro.