Prep veggies. Finely slices scallions, separating the whites and greens. Chop six tablespoons of cilantro. Peel sweet potato; cut into quarters lengthwise and slice thinly.
Start the soup! Heat vegetable oil in medium saucepan over medium high heat until shimmering. Add curry paste, scallion whites, and 3 tablespoons cilantro, and cook for 1 minute.