Indian Achaar Mango with Black Salt and Asafoetida

Name: Indian Achaar Mango with Black Salt and Asafoetida
Prep time: 25 min
Cook time: 5 min
Total time: 30 min
Yield: 8 servings
Cuisine: North Indian
Ingredients: 4 medium (1200 g) firm, unripe green mangoes, washed, wiped dry, pitted, cut lengthwise into 8 wedges each; 2 tablespoons (30 g) black salt (kala namak); 1½ tablespoons (23 g) pickling salt or sea salt (not iodized); 1 tablespoon (15 g) brown mustard seeds; ¾ teaspoon (4 g) fenugreek seeds (methi); ¼ teaspoon (1 g) asafoetida powder (hing); ¾ cup (180 ml) mustard oil; ½ teaspoon (3 g) ground turmeric; 1 teaspoon (5 g) red chili powder (Kashmiri or cayenne)

From the MyKitchenBank Kitchen

A pungent, tangy fermented mango pickle from Northern India. Green mangoes are cut into wedges, salt-cured, and infused with black salt, asafoetida, mustard seeds, and fenugreek in warm oil. Over days of fermentation, the flavors deepen and meld. Serve as a condiment with rice, dhal, or flatbread—a small spoonful adds sharp, funky complexity to any meal.

Prep: 25 min
Cook: 5 min
Wait: 1 days
Total: 1 days
Makes: 1 jar (2 cups / 500 ml); about 16 servings of 2 tablespoons each

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Steps

Before you start

Use firm, unripe (green) mangoes—they should resist pressure when squeezed
Have a clean, dry glass jar with a tight-fitting lid ready (1-liter / 1-quart capacity or larger)
Do not use iodized salt; black salt and pickling salt are best
Choose a warm, dry spot indoors (70–80°F / 21–27°C) for fermentation

1
Prepare the mangoes
- Wash and thoroughly dry the green mangoes.
- Using a sharp knife, cut each mango lengthwise on either side of the pit to create 2 large pieces per mango.
- Cut each piece lengthwise again to form 4 long wedges per mango (8 wedges total per mango).
- You should have 32 wedges.
- Pat them dry with a clean cloth—any excess moisture will dilute the brine and slow fermentation.
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Ready when: Mangoes cut into uniform long wedges; completely dry
Tip: Do not remove the skin—it helps the mango hold its shape during fermentation
2
Salt the mangoes
- Combine the black salt (30 g / 2 tablespoons) and pickling salt (23 g / 1.5 tablespoons) in a small bowl.
- In a clean glass jar, layer the mango wedges with the salt mixture, sprinkling salt between layers and ensuring all surfaces are coated.
- Pack them snugly so they are submerged by their own juices.
- Cover loosely and set aside in a warm spot (70–80°F / 21–27°C) for 12 hours.
- The mangoes will release liquid and soften slightly.
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Ready when: Mangoes have released clear to pale yellow liquid, covering at least halfway up the jar
Tip: If liquid doesn't cover the mangoes after 12 hours, don't worry—the oil will help submerge them
3
Toast the spices
- Heat the mustard oil in a small saucepan over medium-low heat for about 2 minutes until warm but not smoking.
- Add the mustard seeds (15 g / 1 tablespoon) and fenugreek seeds (4 g / 0.75 teaspoon).
- Toast for 1–2 minutes, stirring constantly, until fragrant and the seeds begin to crackle and pop.
- The oil should smell sharp and peppery.
- Remove from heat and let cool for 2 minutes.
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Ready when: Seeds crackle, darken slightly, and release peppery aroma; oil is fragrant
Tip: Do not let the seeds burn—they should pop gently, not blacken. Burnt spices will ruin the pickle
4
Infuse the oil with aromatics
- While the oil is still warm (not hot), stir in the asafoetida powder (1 g / 0.25 teaspoon), turmeric (3 g / 0.5 teaspoon), and red chili powder (5 g / 1 teaspoon).
- Mix well until the spices are fully dissolved in the oil and no lumps remain.
- The oil should turn golden-orange.
- Let it cool to room temperature for about 10 minutes.
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Ready when: Oil is smooth, homogeneous, and no longer steaming; fragrant spices are fully dissolved
Tip: Add spices to warm (not hot) oil so they don't scorch; cool completely or you'll damage the fermenting mangoes
5
Combine mangoes and oil
- Pour the cooled spiced oil over the salt-cured mango wedges in the jar, including all the seeds.
- Stir gently with a wooden or stainless-steel spoon to distribute the oil evenly and ensure all mangoes are well coated and submerged.
- The oil should mostly cover the mangoes; some wedges may peek slightly above, which is fine.
- Wipe the rim of the jar clean with a dry cloth.
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Ready when: All mango wedges are coated in spiced oil and mostly submerged; jar is clean and dry on the outside
Tip: Use a stainless-steel or wooden spoon—metal can react with the salt and discolor the pickle
6
Ferment the pickle
- Cover the jar with a tight-fitting lid.
- Place it in a warm, dry spot indoors away from direct sunlight (70–80°F / 21–27°C is ideal).
- Over the next 3–5 days, the pickle will ferment: the mangoes will darken, become more tender, and develop a sharper, funkier aroma.
- Open the jar once daily (gently stir if you like), then re-cover.
- You may see slight bubbling or separation of oil—this is normal fermentation.
- By day 5–7, the achaar should taste pungent, tangy, and complex.
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Ready when: Mangoes are darker, softer, and smell aggressively pungent (like fermented funk and black salt); flavor is sharp and complex, not unpleasantly sour
Tip: Fermentation speed depends on room temperature—warmer = faster. If it smells rotten or shows mold, discard and start again
7
Test and adjust
- After 5 days of fermentation, taste a small piece of mango (about 1 teaspoon).
- The flavor should be pungent, tangy, and richly salted, with a funky asafoetida note.
- If it tastes too sharp or salty, you can add a little more oil (1–2 tablespoons).
- If it seems under-fermented (too mild or sour), cover and let it sit 2–3 more days.
- Once you're happy with the flavor, the pickle is ready to use.
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Ready when: Flavor is pungent, complex, and balanced—not overly sour or rotten-smelling
Tip: Taste after day 3 to monitor fermentation; you can eat it earlier if you prefer a sharper, less-mellow flavor

Good to know

Tips

Green mangoes are essential—ripe mangoes will turn mushy and sweet, not tart. Look for mangoes that are hard, pale green, and show no blush
Fermentation is faster in warm kitchens (75–80°F / 24–27°C) and slower in cool ones. Patience is key—don't rush it. Under-fermented achaar tastes merely salty and sour; fully fermented achaar is complex and funky
A small spoonful goes a long way. This is a condiment meant to accent rice, dhal, or flatbread, not eat by the spoonfull. It cuts through rich foods and adds sharp, savory depth
If white mold appears on the surface, carefully remove it (it's usually harmless), stir, and re-cover. If it smells rotten, putrid, or has black/fuzzy mold, discard the whole batch

Storage & reheating

Room temperature (in a tightly sealed jar, away from sunlight): 2–3 months. The cold will slow fermentation, so you may prefer to keep it on a cool shelf rather than the fridge. Refrigerator (tightly sealed): up to 6 months; flavor and texture will be preserved, though fermentation will nearly stop. Freezer: not recommended (oil separates and texture is lost). Serve at room temperature—spoon out small amounts with a clean, dry utensil and re-seal immediately. It will keep longest in cool conditions with minimal air exposure.

Substitutions

mustard oil → vegetable oil or coconut oil. Mustard oil gives the traditional peppery bite; vegetable oil is milder and won't develop the same funk, but the pickle will still work. Coconut oil adds sweetness and works well if you prefer a softer flavor
black salt (kala namak) → additional pickling salt (use 3 tablespoons / 45 g total salt instead). Black salt (kala namak) has a distinctive funky, sulfurous flavor. Plain salt will make a milder, less complex achaar, but it will still ferment and taste good
fenugreek seeds (methi) → nigella seeds (kalonji) or increase mustard seeds to 1.5 tablespoons. Fenugreek adds a warm, maple-like note. Nigella is earthier. Mustard alone works but will be sharper and less nuanced
asafoetida powder (hing) → omit or use 0.125 teaspoon (0.5 g) if you find it too strong. Asafoetida (hing) is the signature 'funk' of classic achaar. Start with the full amount; you can always use less next time