Macadamia and Roasted Sweet Potato Soup

INGREDIENTS

medium red onions, (peeled and quartered)

7 cups

peeled and cubed orange-flesh sweet potatoes, ((2lbs/1kg))

3 tbsp

grapeseed oil ((or extra-virgin olive oil))

1 tsp

Celtic sea salt, (plus more to taste)

8 cups

vegetable broth

2 tsp

minced fresh ginger

1/2 tsp

ground turmeric

cayenne pepper, (plus more to taste)

1/4 cup

raw unsalted macadamias

Fresh lime juice, (to serve)

2 tbsp

finely chopped fresh cilantro, (to serve)