Heat oil in a large saucepan or wok over high heat. Add garlic and ginger; cook until fragrant and lightly browned.
Add shrimp; stir-fry until cooked. Remove and set aside.
Add chicken stock to the pan; bring to a boil.
Reduce heat to medium. Add tofu and peas; season with salt and black pepper.
Return to a simmer, then mix cornstarch with 1 tbsp water. Stir into soup and continue to simmer until clear and thickened (about 1 min).
Add shrimp back to the soup; stir and serve.
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