Prepare all ingredients.
In a large pot, heat oil over medium heat. Add ginger, red curry paste, and lemongrass; cook for 1 minute, stirring constantly.
Gradually pour in chicken broth, followed by fish sauce and brown sugar. Reduce heat to low and simmer for 15 minutes.
Stir in coconut milk and shiitake mushrooms. Cook until the mushrooms are tender, about 5 minutes.
Add shrimp and cook until they're no longer translucent, approximately 5 minutes. Pour in lime juice, season with salt, then garnish with cilantro.
Serve and savor your delicious Thai coconut shrimp soup!
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