Heat olive oil in a large stockpot over medium heat. Add onion and cook, stirring frequently until onion is tender and translucent, about 5 minutes. Add sweet potatoes, ginger, curry paste, and coconut milk and stir to combine. Add vegetable broth,bring to a boil, cover, reduce heat and simmer for 30 minutes or until sweet potatoes are very tender. Remove from heat and allow to cool, uncovered, for at least 10 minutes.

Blend using an immersion blender, or alternatively, blend in small batches in a blender, taking care to vent the lid to allow steam to escape. Return pureed soup back to the pot. Stir in lime juice and salt. Taste for seasoning and adjust as needed. If necessary, thin with additional vegetable broth until you get your desired texture.

Garnish with chopped cilantro and sliced jalapeno peppers.