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1
Bring stock to boil in pot over high heat.
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2
Add chilies, lemongrass, galangal, and kaffir lime leaves; simmer 5 minutes to infuse aromatics.
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3
Add shrimp and mushrooms; simmer 3–4 minutes until shrimp are opaque and mushrooms are tender.
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4
Stir in tamarind paste, fish sauce, and palm sugar; simmer 2 minutes to meld flavors.
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5
Remove from heat; adjust seasoning with lime juice, adding more tamarind or fish sauce to balance sour and salty notes.
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6
Ladle into bowls; garnish with cilantro leaves and scallions; serve immediately.