A cooking platform built around craft, culture, and the stories behind what we eat.
Created by
Tom yum is the one dish that breaks the kreung tam rule. This paste breaks it back. Every aromatic that normally floats whole in the broth, pounded into a concentrated bomb you can jar, store, and deploy in minutes.
Here's the paradox. Tom yum is the single dish in the Thai system that doesn't use a kreung tam. Ajarn always said: every Thai dish starts with a pounded paste, except soups infused with whole herbs. Tom yum is the exception. Lemongrass, galangal, kaffir lime leaves, whole, bruised, dropped into broth.
So why am I teaching you a tom yum paste?
Because a kreung tom yum takes the exception and brings it back into the system. You pound those same aromatics into a concentrated base that you can jar, refrigerate, freeze, and pull out whenever you want tom yum on a Tuesday night without prepping fourteen ingredients from scratch. It's the kreung tam framework applied to the one dish that normally escapes it. That's not breaking a rule. That's understanding the rule well enough to bend it.
The mortar order matters here. Lemongrass and galangal are tough, fibrous, stubborn. They go in early and they take work. The chilies and garlic break down faster. The shrimp paste goes in last because it's wet and it binds. Kaffir lime zest is the most volatile, the last dry ingredient before the kapi, because those citrus oils evaporate if you pound them too long. Every ingredient enters the krok at the right moment for a reason. The order isn't tradition for tradition's sake. It's physics.
Ajarn taught me: if you understand why each ingredient is in the mortar, you understand what it does in the dish. Lemongrass gives you citral, that sharp lemon-herb brightness. Galangal gives you piney, gingery heat that's nothing like ginger. Kaffir lime zest is pure citrus oil intensity. Dried chilies bring smokiness and color. Fresh chilies bring sharp, immediate heat. Cilantro root is earthy and anchoring. Shrimp paste is the umami depth charge. Shallots and garlic are the aromatic foundation of every kreung tam in the Thai system. You're not just pounding ingredients. You're building a flavor architecture.
Fry this paste in oil until it's fragrant and the oil separates. That's how you know it's cooked. Then it goes into a jar. Two tablespoons in hot water with shrimp, mushrooms, fish sauce, lime, and you have tom yum in ten minutes. That's the power of the kreung tam. The work happens once. The cooking happens fast.
Tom yum as a broth dates to the early Rattanakosin period in Central Thailand, traditionally made with whole herbs infused directly in water. The practice of pounding those aromatics into a storable paste is a practical adaptation that gained popularity with Thailand's industrialization, when home cooks and vendors needed faster preparation methods. Commercial tom yum paste (sold in jars since the 1980s by brands like Pantai and Mae Pranom) standardized the concept, but homemade versions remain superior because the volatile oils in lemongrass and kaffir lime degrade rapidly in shelf-stable products.
Quantity
6 stalks
tender inner core only, thinly sliced
Quantity
8 slices (1/4 inch thick)
roughly chopped
Quantity
zest of 3 fruits
finely removed, no white pith
Quantity
6
central vein removed, very finely sliced
Quantity
10
soaked 15 minutes, drained and seeded
Quantity
8
Quantity
8
roughly chopped
Quantity
10 cloves
roughly chopped
Quantity
4
scrubbed and chopped
Quantity
1 tablespoon
Quantity
1 teaspoon
Quantity
3 tablespoons
for frying the paste
| Ingredient | Quantity |
|---|---|
| lemongrass (takhrai)tender inner core only, thinly sliced | 6 stalks |
| galangal (kha)roughly chopped | 8 slices (1/4 inch thick) |
| kaffir lime zest (makrut)finely removed, no white pith | zest of 3 fruits |
| kaffir lime leaves (bai makrut)central vein removed, very finely sliced | 6 |
| dried red chilies (prik haeng)soaked 15 minutes, drained and seeded | 10 |
| bird's eye chilies (prik khi nu) | 8 |
| shallots (hom daeng)roughly chopped | 8 |
| garlic (kratiem)roughly chopped | 10 cloves |
| cilantro roots (rak pak chi)scrubbed and chopped | 4 |
| shrimp paste (kapi) | 1 tablespoon |
| salt | 1 teaspoon |
| vegetable oilfor frying the paste | 3 tablespoons |
Soak the dried red chilies in warm water for 15 minutes until they're soft and pliable. Drain, shake off excess water, and tear them open to remove most of the seeds. Keep a few seeds if you want more heat. The dried chilies give the paste its deep, smoky backbone and its reddish color. Fresh chilies alone won't do that. You need both.
Start with the salt in the bottom of a heavy granite mortar (krok hin). The salt is your abrasive. It grips the ingredients against the stone and helps break them down. Add the drained dried chilies and the fresh bird's eye chilies. Pound firmly until you have a rough, fibrous paste. The chilies won't go smooth, and that's fine. You want them broken down enough to release their oils and pigment. The mortar should already smell sharp and hot.
Add the garlic and shallots to the mortar. Pound until they break down into the chili paste and everything starts to look wet and integrated. The garlic should be completely crushed, the shallots reduced to a fibrous pulp. These are the aromatic base of almost every kreung tam in the Thai system. They don't just add flavor. They create the body of the paste, the structure that holds everything together.
Add the sliced lemongrass first. Pound hard. Lemongrass is fibrous and stubborn. It fights back. Keep pounding until the fibers break and the paste turns fragrant and slightly wet with released oils. Your kitchen should smell like a Thai pharmacy right now: sharp, citrusy, herbal. Then add the chopped galangal. More pounding. Galangal is even tougher than lemongrass. It's dense and woody. Slice it thin before it goes in, or you'll be pounding all day. Then the cilantro roots. They break down faster, earthy and green, the anchoring note that ties the high aromatics to something grounded.
Add the finely sliced kaffir lime leaves and the kaffir lime zest. Pound just until incorporated. This is the volatile layer. The citrus oils in makrut zest evaporate fast under heat and friction, so it goes in late and it gets pounded briefly. You want those oils trapped in the paste, not lost to the air. The aroma shift should be immediate: the paste goes from earthy-hot to bright-citrus-hot. That's the makrut doing its job.
Add the shrimp paste (kapi) last. Pound it in until the paste is uniform in color and texture. Kapi is the umami depth charge. It's wet, so it binds everything together and gives the paste its final consistency. The finished kreung tom yum should be rough but cohesive, fragrant enough to make your eyes water slightly, reddish-brown with visible flecks of chili and lemongrass fiber. Taste a tiny bit on your fingertip. It should be intensely aromatic, salty from the kapi, and hot. If it doesn't hit you in the back of the throat, you need more chili.
Heat the vegetable oil in a small saucepan or wok over medium heat. Add the entire paste and fry, stirring constantly, for 5 to 7 minutes. The paste will sizzle and sputter. The color will deepen. The aroma will shift from raw and sharp to rounded and complex. You'll know it's done when the oil starts to separate and pool at the edges of the paste, and the raw shrimp paste smell disappears completely. That oil separation is the signal. It means the moisture has cooked out and the paste is ready for storage.
Let the paste cool completely in the pan. Transfer to a clean glass jar with a tight lid. Press it down to eliminate air pockets. Pour a thin layer of oil over the top to seal it. Refrigerate. It keeps for a month. To use: two tablespoons of paste in four cups of hot water, add your protein and mushrooms, finish with nam pla, nam manao, and nam tan pip. Tom yum in ten minutes. The kreung tam did the work for you.
1 serving (about 40g)
Culinary guides, cultural storytelling, and the editorial depth that makes cooking meaningful.
Discover Culinary Explorer
Chef Fai
Nam prik pao is a kreung tam: pounded dried chilies, shrimp paste, shallots, garlic, all caramelized in palm sugar and fish sauce. Coat day-old rice in it. That's the whole dish. One paste. Total command.
Chef Fai
The kreung tam doesn't rest, not even for a snack. Pounded paste cracked into coconut cream, spooned over golden rice that shatters on contact. Four pillars in every bite.
Chef Fai
The kreung tam that proves the system adapts. Ginger instead of galangal, cumin and star anise alongside lemongrass. Lanna's mortar holds the whole Burma-to-Chiang Mai trade route in a single paste.
Chef Fai
Four ingredients pounded clean in a granite mortar. This is the kreung tam stripped to its essence: dried chilies for heat, shallots for aromatics, turmeric for earth, kapi for depth. The foundation of Thailand's most underestimated curry.