Prep your pumpkin: Peel and cube the pumpkin into roughly 1-inch pieces.
Smaller cubes cook faster and blend smoother.
Sauté the aromatics: Warm the oil in a large pot over medium heat. Add onion with a pinch of salt and cook until translucent, about 5 minutes. Stir in garlic and ginger for 30 seconds until fragrant.
Bloom the spices: Add red curry paste, coriander, cumin, and turmeric.
Stir for 1 minute to release the oils and deepen the flavor.
Add the pumpkin: Toss the cubes in the pot to coat with the paste and spices. Cook 2–3 minutes to get a little caramelization on the edges.
Pour in the broth: Add the vegetable broth and bring to a gentle boil. Reduce to a simmer, cover partially, and cook 15–20 minutes, until the pumpkin is very tender.
Blend until smooth: Use an immersion blender to puree directly in the pot, or carefully transfer to a blender in batches.
Blend until velvety. If it’s too thick, add a splash of broth or water.
Finish with coconut and seasoning: Return the soup to low heat. Stir in coconut milk, fish sauce (or soy/tamari), and brown sugar.
Simmer 3–5 minutes. Taste and adjust with more salt, sugar, or fish sauce as needed.
Brighten with lime: Stir in lime juice. This step lifts the flavors, so don’t skip it.
Serve and garnish: Ladle into bowls and top with cilantro or Thai basil, a sprinkle of pumpkin seeds or peanuts, and extra chili if you like heat.
Add a lime wedge on the side for those who want more zing.