Sweet Potato Lentil Curry Soup

Name: Sweet Potato Lentil Curry Soup
Ingredients: 2 tablespoons olive oil; 1 large red onion, minced; 6 garlic cloves, minced; 1/4 cup peeled and minced ginger root; 1 1/2 tablespoons curry powder; 1/2 teaspoon red pepper flakes; 1 cup carrots, diced; 1 cup diced red pepper; 5 cups diced sweet potatoes; 14 ounces coconut milk; 2 cups dried lentils, washed; 8 cups vegetable stock; 1 lime, juiced; 1 bunch cilantro, minced; 1/4 cup tamari; salt and pepper to taste; sugar to taste (see headnote)