Sweet corn and lump crab meat combine in a thick, creamy soup. This protein-rich, elegant family soup is a Cantonese banquet staple with a delicate balance of sweet and savory.
In a large saucepan over medium heat, bring the chicken broth and sweet corn kernels to a gentle simmer. Simmer for 8–10 minutes to release the corn's natural sweetness.
While the soup is simmering, whisk together cornstarch and water in a small bowl to make a smooth slurry; set aside for thickening later.
Stir in the lump crab meat to the simmering soup and let it gently cook for 2–3 minutes, taking care not to break up the crab clusters.
Give the cornstarch slurry a quick stir and slowly pour it into the soup, stirring constantly, until the soup thickens and becomes glossy, about 2 minutes.
In a steady stream, drizzle in the beaten eggs while stirring the soup in one direction to create signature thin egg ribbons. Immediately season with salt, white pepper, sugar, and finish with sesame oil. Ladle into bowls and garnish with scallion slices.