Aromatic bases & spice pastes
Korma Base
Korma Masala Base · A slow-fried onion foundation bound with yogurt and/or tomato and bloomed with warm ground spices (coriander, cumin, turmeric) that serves as a reusable aromatic building block for korma-style curries. It is a foundational component, not a finished dish, designed to be portioned, frozen, and finished with proteins, vegetables, cream, or nuts at the time of cooking.
The formula
2:1 fried onion : yogurt/tomato (raw onion ~3x vol before frying)
Onions lose roughly two-thirds of their volume as they fry down to deep golden; the cooked reduction is then combined with roughly half its weight in yogurt and/or tomato to form the base.
Identity
- Reusable restaurant-style master base, portioned and frozen
- Built on a deep golden slow-fried onion reduction, not raw onion
- Mild, warm spice profile dominated by coriander and cumin rather than chili
- Bound with yogurt and/or tomato rather than cream or nut paste
- Signals doneness when oil separates at the edges (bhunao)
Ingredients
| Base | Yellow onion (thinly sliced) | Slow-fried from ~3x volume down to deep golden; provides sweetness and body. |
| Fat | Oil or ghee | Medium-high heat fat for frying onions without burning; ghee adds richness. |
| Acid | Plain yogurt (whisked) | Adds tang, tenderizes proteins, and binds the fried onion into a paste. |
| Acid | Tomato (puréed or finely chopped) | Used alongside or in place of yogurt for a deeper, less tangy base. |
| Aromatics | Ginger-garlic paste | Bloomed after onions for savory depth; common in restaurant-style korma bases. |
| Flavor | Ground coriander | Dominant warm, citrusy note of the korma profile. |
| Flavor | Ground cumin | Adds earthy warmth; complements coriander. |
| Seasoning | Ground turmeric | Provides the characteristic pale golden color and mild bitterness. |
Method
- 1Slice onions thinly and fry in oil or ghee over medium-low heat, stirring often, until deep golden and reduced to roughly one-third of original volume.Slow frying converts onion sugars and drives off moisture, producing the sweet, mellow backbone korma is known for; high heat causes bitterness.
- 2Add ginger-garlic paste (if using) and sauté 1–2 minutes until raw aroma disappears.Blooming aromatics in the onion's residual oil releases fat-soluble flavor compounds without scorching.
- 3Add ground coriander, cumin, and turmeric; stir 30 seconds to bloom in the oil.Dry spices need direct fat contact to release their volatile oils and avoid a raw, dusty taste in the finished base.
- 4Stir in whisked yogurt and/or tomato and cook, stirring, until the mixture thickens and oil visibly separates at the edges (bhunao).The bhunao signal confirms moisture has cooked off and the base is stable for storage and finishing.
- 5Cool slightly, then blend to a smooth paste if a uniform texture is desired; alternatively leave coarse.A smooth paste integrates quickly into finished curries; a coarse base gives more rustic texture.
- 6Cool fully, portion, and refrigerate or freeze in usable amounts.Portioning avoids repeated thawing and preserves freshness over weeks or months.
Techniques that matter
Bhunao (slow reduction until oil separates)
Confirms the base is cooked through, stable for storage, and ready to absorb finishing dairy, nuts, or proteins without splitting.
Low-and-slow onion fry
Builds the characteristic sweet, mellow korma backbone; rushing produces bitter, burnt notes.
Tempering ground spices in fat
Releases fat-soluble aromatics from coriander, cumin, and turmeric before any wet ingredient is added.
Variations & derivatives
Yogurt-forward base (North Indian Mughlai style)Lucknow / Delhi
Uses mostly yogurt with little or no tomato; lighter color, sharper tang.
Tomato-forward base (restaurant-style)North Indian restaurants
Uses mostly tomato; deeper color, longer shelf life, milder tang.
South Indian-style korma baseKerala / Tamil Nadu
Often omits yogurt, leans on coconut milk and a freshly ground wet paste of coconut, cashew, and green chili.
Whole-spice korma masala (dry)Homestyle pan-India
Dry-roasted and ground whole spices (black pepper, shahi jeera, fennel, star anise, nutmeg) used in addition to or instead of the wet base.
Used in these dishes
Substitutions
- Yogurt → Coconut milk — Dairy-free option; produces a milder, sweeter base suited to coastal kormas.
- Tomato → Tamarind pulp or amchur — Adds acidity without tomato's deep color or cooked-fruit notes.
- Ghee → Neutral oil — Lactose-free and lighter, but loses the nutty richness ghee contributes.
- Ginger-garlic paste → Asafoetida (hing) bloomed in oil — Useful when garlic must be avoided; flavor is more savory than aromatic.
Troubleshooting
Base tastes bitter or sharp
Onions fried too hot or scorched, or spices burned before wet ingredients were added. → Lower the heat, fry onions to a deep but not browned color, and bloom spices only briefly after onions are fully cooked.
Base is thin and watery
Bhunao stage was skipped — yogurt/tomato moisture never fully cooked off. → Continue cooking over medium heat until oil visibly separates at the edges before cooling and storing.
Base splits or curdles in finished curry
Yogurt added too cold or over high heat to a hot base. → Whisk yogurt to room temperature and temper it in gradually off the heat, or finish the base fully (bhunao) before any further dairy is added.
Base lacks depth and tastes flat
Spices were added after the wet ingredients, so they never bloomed in fat. → Always temper ground coriander, cumin, and turmeric into the residual oil after onions are done and before adding yogurt/tomato.