Melt the butter in a soup pot and saute the onion and ginger for 10 minutes, stirring often. Don't let it brown.
Add the carrots and stock or water. Add the cayenne and saffron. Bring to a boil, turn down the heat, cover, and simmer on low for about 20 minutes, or until the carrots are just tender.
Working in batches, puree the soup until smooth.
Put back in the rinsed out pot, and reheat. Thin with more stock or water if necessary. Add the lime juice, and salt and pepper to taste. Serve hot.
Notes
If you don't have saffron you can use a pinch of turmeric to boost that golden color.
Nutritional information is provided as a courtesy and is an estimate only. This information comes from online calculators. Although The View from Great Island attempts to provide accurate nutritional information, these figures are only estimates.
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