Tom Kha Gai (Thai Coconut Chicken Soup)

Coconut milk soup with chicken, galangal, lemongrass, and lime. Teaches the Thai principle of balancing sour, salty, sweet, and spicy in a single bowl.

Ingredients

• 2 cans (13.5 oz each) full-fat coconut milk
• 1 cup chicken stock
• 3 stalks lemongrass, bottom 4 inches only, smashed and cut into 2-inch pieces
• 6 slices galangal (or fresh ginger, 1/4-inch thick)
• 4 kaffir lime leaves, torn (or zest of 1 lime)
• 2 Thai bird chiles, smashed (or 1 serrano)
• 1 lb boneless chicken thighs, sliced thin against the grain
• 8 oz mushrooms (oyster or straw preferred, button works), sliced
• 3 tbsp fish sauce
• 2 tbsp lime juice (about 2 limes)
• 1 tbsp palm sugar or brown sugar
• Fresh cilantro leaves
• Chile oil for serving (optional)

Method

1. Pour coconut milk and chicken stock into a pot. Add lemongrass, galangal, lime leaves, and chiles. Bring to a gentle simmer over medium heat. Cook 10 minutes to infuse the aromatics into the coconut milk.

2. Add chicken slices and mushrooms. Simmer gently for 8-10 minutes until chicken is cooked through. Do not boil vigorously — coconut milk can separate at high heat.

3. Remove from heat. Stir in fish sauce, lime juice, and sugar. Taste and adjust: it should be simultaneously sour (lime), salty (fish sauce), slightly sweet (sugar), and spicy (chiles). Each sip should hit all four notes.

4. Ladle into bowls. The lemongrass, galangal, and lime leaves are aromatic — they flavor the broth but are not meant to be eaten. Garnish with cilantro and chile oil.

What You're Practicing

What You're Practicing

Flavor balancing: Thai cuisine is built on the interplay of four tastes — sour, salty, sweet, and spicy. Tom Kha Gai is the perfect training ground because you adjust each element independently at the end. Start with fish sauce (salty), then lime (sour), then sugar (sweet), tasting after each addition. The soup should not taste predominantly of any single element.

Aromatic infusion: Unlike Western cooking where aromatics are diced and left in the dish, Thai soups use large pieces of lemongrass, galangal, and lime leaves that infuse flavor into the liquid and are left in the bowl but not eaten. This is closer to how a tea is brewed — the aromatics steep rather than cook.

Coconut milk handling: Full-fat coconut milk is an emulsion of coconut oil and water. Gentle heat keeps it smooth and creamy. Aggressive boiling breaks the emulsion, causing the oil to separate and float on top. If this happens, the soup is still edible but loses its silky texture.

Galangal vs. ginger: Galangal looks like ginger but tastes sharper, more piney and citrusy. It's essential for authentic Tom Kha. If substituting ginger, use slightly less and add extra lime zest to compensate for the missing citrus notes.