Heat oil in a large pot over medium heat
Add leeks and sauté for about 5 min
Stir in tomato paste, peanut butter, chili paste, garlic, turmeric, and cumin
Cook one min stirring constantly
Add sweet potatoes, broth, and 1cup of water
Simmer over medium heat, partially covered for 20-25min or till sweet potatoes are tender
Carefully transfer mixture into a blender, blend on medium speed, adding more water if soup it to thick
Pour soup back into a pot, bring back to simmer, stir in spinach leaves
Serve with organic sprouted bread