Clean, peel and rough chop the veggies. Place the veggies and garlic on a baking pan lined with parchment. Season with a tablespoon of olive oil, salt and pepper. Roast in the oven for 45-60 minutes until fork tender.
Add the coconut milk, broth, tamari and fish sauce to a heavy pan and bring to a simmer.
Puree the roasted vegetables, using a blender or immersion blender, in batches. Then add to the liquid heating in the pot. Stir to combine
Continue simmering the soup for 5-10 minutes and adjust the seasoning as desired.
Serve with a swirl of sour cream and a sprig of cilantro and enjoy.