Reserve the shells
Peel the shrimp if desired, leaving tails on. Reserve heads and shells and keep the shrimp cold.

A hot-sour Thai broth with lemongrass, galangal and makrut lime — deeply prawn-flavored, but with the shrimp themselves poached for only about ninety seconds.
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Peel the shrimp if desired, leaving tails on. Reserve heads and shells and keep the shrimp cold.
Toast heads and shells in a dry pot until orange. Crush lightly, add stock with half the lemongrass and galangal, and simmer 15 to 20 minutes. Strain.
Return stock to the pot. Add remaining lemongrass, galangal, half the lime leaves, shallots and chiles. Simmer gently 5 minutes.
Add mushrooms and simmer 2 minutes.
Add the shrimp and poach about 90 seconds to 2 minutes depending on size, just until opaque. Turn off the heat.
Stir in fish sauce, nam prik pao and palm sugar. Add evaporated milk if using.
Add lime juice and remaining torn lime leaves off heat. Taste until the broth reads hot, sour and salty in balance. Finish with herbs and serve immediately.
OPTIONAL UPGRADE
Keep the core recipe clean, or flip this on for one or two high-impact upgrades.
Use these recipe-specific texture cues. Color and curl alone cannot establish safety; use a thermometer to check 145°F / 63°C at the thickest part for cooked shrimp.
The little details that make a big difference.
Heads, shells and aromatics can simmer. The shrimp meat cannot.
Boiling lime juice dulls the fresh aroma and can push bitterness.
Head fat gives Tom Yum Goong its orange sheen and deep prawn character.
Big shrimp remain plump in the hot broth and are easier to time.