Instructions: Heat oil in heavy large saucepan over medium-high heat. Add onion and chili; saute until tender, about 5 minutes. Stir in ginger and next 4 ingredients and cook 1 minute. Mix in 7 cups water, sweet potato and peas.

Bring mixture to boil. Reduce heat to medium-low, cover and simmer until potato and split peas are very tender, about 1-1/2 hours.

Whisk soup vigorously for smoother texture. Thin with additional water if necessary. Season with salt and pepper. (Can be prepared 1 day ahead.

Refrigerate.) Return soup to simmer. Ladle soup into bowls. Top each with 1 tablespoon yogurt, lime slice and cilantro and serve.

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