Aromatic bases & spice pastes
rempah
rempah · A cooked or uncooked aromatic spice paste forming the foundational flavor base of Malay, Indonesian, Thai, and broader Southeast Asian cuisine. It is a heterogeneous blend of pounded or blended raw or fried aromatics—shallots, garlic, ginger-family rhizomes, lemongrass, chilies, nuts for body, and fermented shrimp paste—cooked in fat until the raw edge is gone and the paste is fragrant, cohesive, and ready to carry a dish. Rempah is not a sauce or condiment; it is the aromatic engine from which curries, braises, sambals, and rice dishes are built.
The formula
3:1:1 shallots : garlic : galangal/ginger by weight
Base aromatics (shallots + garlic + galangal) constitute ~75% of total paste; candlenuts 10–15%; belacan 3–5%; dried chilies 10–30% of base weight. For 500g finished paste: ~300g shallots, 100g garlic, 100g galangal, 75g candlenuts, 20g belacan, 50g rehydrated chilies. Yields enough for 4–6 portions of curry or rendang.
Identity
- Shallots form the dominant aromatic bulk—their higher sugar content and sulfur compounds caramelize differently from onion, yielding a sweeter, more complex foundation
- Ginger-family rhizomes (galangal, ginger, turmeric) are always present, providing camphoraceous warmth, floral notes, and color depending on the variety
- Candlenuts (or fat-rich nuts) are the essential binder—without them the paste lacks cohesion and emulsification capacity when simmered in coconut milk
- Belacan (fermented shrimp paste) is non-negotiable for authentic savory depth—its nucleotides amplify umami and its sulfur compounds build complexity
Ingredients
| Base | Shallots | Use 3× garlic weight. Shallots caramelize more evenly and provide sulfurous sweetness that garlic alone cannot. |
| Base | Garlic | Use ⅓ shallots weight. Provides savory, pungent backbone. |
| Aromatics | Galangal (or ginger) | Weight equals garlic weight (1:1 ratio). Galangal is more floral and piney; ginger is more citrusy. Use galangal for Malay/Indonesian rempah, ginger for Thai-style. |
| Aromatics | Lemongrass (white portion only) | Use 1–2 stalks per 500g paste. Essential in Thai and many Malay preparations; omit for certain Indonesian styles. |
| Binder | Candlenuts (or macadamia, raw cashews) | Use 10–15% of total vegetable weight. Provide emulsification and body; prevent the paste from breaking when cooked in coconut milk. |
| Aromatics | Dried chilies (Kashmiri or Holland), rehydrated | 10–30% of base weight depending on desired heat. Seeds removed for color, retained for heat. Fresh chilies acceptable but lack the deep, rounded heat of dried. |
| Seasoning | Belacan (fermented shrimp paste), toasted | Use 3–5% of total weight. Wrap in foil and toast under a broiler or in a dry pan until fragrant (2–3 min). This is the umami engine. |
| Fat | Coconut oil or neutral vegetable oil | Sufficient to coat the pan generously (approx. 2–3 tbsp per 500g paste). Fat extracts fat-soluble aromatic compounds from turmeric and belacan and enables Maillard browning. |
Method
- 1Pound or blend shallots, garlic, galangal, lemongrass, and rehydrated chilies to a rough paste, adding water in small increments if using a blender to facilitate grinding.Pounding breaks cell walls mechanically, releasing enzymes and creating a coarser, more textured paste than blending. Blending is acceptable for speed; the paste will be smoother but equally functional.
- 2Add toasted belacan and candlenuts. Continue pounding or blending until the mixture forms a smooth, cohesive paste.Candlenuts contain lecithin and emulsifying oils that bind the water-based aromatics to the fat that will be added during cooking, preventing separation in the finished dish.
- 3Heat oil in a wide heavy pan (wok or kuali) over medium heat until shimmering. Add the spice paste in one addition. Stir immediately and constantly.The sudden addition of paste to hot fat creates an immediate sear. Constant stirring prevents the bottom from burning before the top portions heat through—this is a paste, not a roux.
- 4Cook, stirring every 30–60 seconds, for 8–12 minutes, until the paste darkens slightly, the raw shallot smell is gone, the oil is visibly incorporated (the paste looks glossy), and the paste 'spits' gently when the heat is high.The Maillard reaction between sugars in the shallots and proteins in the belacan builds savory complexity. Volatile sulfur compounds cook off, leaving a rounded, cooked aromatic profile rather than harsh raw notes.
- 5Use immediately in the intended dish (curry, braise, sambal base) by adding protein, coconut milk, or other liquids at this stage. Alternatively, cool and store.The rempah is now a cooked aromatic base ready to carry a finished dish. Adding liquid stops the cooking and begins the braising or simmering phase.
Techniques that matter
Pounding (ulek / giling)
Traditional wet-grinding in a stone mortar breaks cell walls more aggressively than blades, preserving enzyme activity and creating a coarser texture that holds up better in long-cooked braises.
Frying in stages (menumis)
Rempah is often added in stages to a dish: first the paste fries in oil until fragrant (tumis), then protein is added to sear, then liquid. This builds layered flavor development rather than a single dump.
Toasting belacan
Dry-toasting belacan before adding it drives off volatile trimethylamine (associated with ammonia smell) and activates Maillard-reactive compounds, transforming a raw fishy smell into a complex, savory aroma.
Variations & derivatives
Rempah merah (red rempah)Malay cuisine
Kashmiri and Holland chilies dominate, giving a brick-red color. Used in rendang, beef curry, and ayam masak merah.
Rempah kuning (yellow rempah)Malay / Indonesian cuisine
Turmeric provides the yellow color. Often includes coriander and cumin seeds. Used in nasi berlada, chicken kurma.
Bumbu Bali (Balinese spice paste)Indonesian (Bali)
Includes palm sugar, salam leaves, and often tomatoes. Thinner consistency, used for lawar and base gede.
Thai green curry pasteThai cuisine
Green chilies dominate; galangal replaces ginger; kaffir lime zest and rind added. Unlike Malay/Indonesian rempah, Thai green paste is often used raw or only briefly cooked.
Sambal rempahMalay / Indonesian cuisine
A spicier, more coarsely pounded variant where chili content is higher and the paste is often fried until very dry and crispy. Used as a finishing condiment.
Used in these dishes
Substitutions
- Galangal → Fresh ginger — Ginger is a reasonable substitute but lacks galangal's pine-floral notes and medicinal quality. Use ¾ the amount of galangal.
- Candlenuts → Raw macadamia or blanched almonds — Both have similar fat content and emulsifying properties. Macadamia is the closest textural match; almonds add slightly more bitterness.
- Belacan → Fermented fish sauce or soy-based umami paste — Neither replicates belacan's specific gamma-aminobutyric acid profile and trimethylamine complexity. Use only if seafood is prohibited; the dish will taste fundamentally different.changes result
- Shallots → Red onion — Shallots have significantly higher sugar content than onion and different sulfur compound ratios. Red onion is acceptable only if shallots are truly unavailable; expect a sharper, less caramelized result.changes result
Troubleshooting
Rempah burns during frying despite constant stirring
Heat too high, paste too dry, or pan too narrow (paste piled too deep) → Reduce to medium heat, ensure oil coats the pan, and add 1–2 tbsp water or coconut milk to the paste to lower the frying temperature and keep the exterior wet.
Finished dish tastes raw and harsh, lacking depth
Rempah not cooked long enough; oil never incorporated; belacan not toasted → Return the dish to a bare simmer and cook longer—raw rempah notes indicate insufficient time for Maillard and caramelization reactions to complete.
Sauce or curry breaks (oil separates, paste clumps)
Too much liquid added too quickly, insufficient candlenuts in the paste, or oil temperature too low when liquid was added → Ensure the rempah was fully cooked and glossy before liquid is added. If breaking occurs, vigorously whisk or blend a small portion of the sauce back into the rempah and reincorporate.
Paste lacks cohesion; ingredients separate during frying
Insufficient binder (candlenuts), or paste was not pounded/blended finely enough → Add 1–2 tbsp of raw cashew or macadamia paste to the rempah and re-blend before cooking.