Equipment
Ingredients
Main Ingredients
- 400 g green beans, trimmed and washed
- 15 ml mustard oil
- 4 g black mustard seeds
- 2 green chilies, slit lengthwise
- 4 g kosher salt, fine
Nutrition (per serving)
Nutrition is estimated per serving. Nutrients without complete source data are omitted.
Full nutrition
- Calories
- 70 kcal
- Protein
- 2 g
- Carbohydrates
- 8 g
- Fat
- 4 g
- Fiber
- 3 g
- Sugar
- 3 g
- Sodium
- 394 mg
- Saturated Fat
- 1 g
- Monounsaturated Fat
- 2 g
- Polyunsaturated Fat
- 1 g
- Potassium
- 227 mg
- Calcium
- 38 mg
- Iron
- 1.1 mg
- Magnesium
- 26 mg
- Phosphorus
- 39 mg
- Zinc
- 0.3 mg
- Vitamin A
- 36 mcg
- Vitamin C
- 18 mg
- Vitamin E
- 0.4 mg
- Vitamin K
- 43 mcg
- Vitamin B6
- 0.1 mg
- Thiamin
- 0.08 mg
- Riboflavin
- 0.10 mg
- Niacin
- 0.8 mg
- Folate
- 34 mcg
- Water
- 93 g
Sources: Aggregated Public Data, USDA FoodData Central
Method
Heat the mustard oil in a large skillet over medium-high heat until it begins to produce a thin wisp of white smoke, reaching approximately 200°C/390°F. This is a critical step to remove the raw, bitter erucic acid compounds from the oil.
Reduce the heat slightly to medium. Add the black mustard seeds to the hot oil. They will immediately begin to pop and crackle.
As soon as the popping subsides, carefully add the slit green chilies and the trimmed green beans. Toss well using a spatula so that the beans are thoroughly coated in the seasoned oil.
Sprinkle the kosher salt over the beans and continue to cook, tossing frequently. Cook until the beans are bright green, tender-crisp, and have slight blistering on their skins.
Remove from heat and transfer the green beans immediately to a serving dish to halt the cooking process. Serve hot.
Chef's Notes
- The smoking point technique is non-negotiable for traditional mustard oil cooking. It transforms the lipid profile, stripping away aggressive acrid notes while leaving a deep, golden savoriness akin to horseradish.
- For the best texture, seek out young, slender green beans (haricots verts) which have a lower moisture content and blister beautifully in high heat.
- Tempering spices in hot fat is an Indian technique called tadka or chaunk. It extracts fat-soluble essential oils from the spices, distributing their flavor evenly throughout the dish.
- Keep the ingredient list strict. The charm of this preparation lies in its minimalism. Extraneous aromatics like garlic or onion will muddy the bright contrast between the green bean and the mustard flavor.
Storage
Refrigerator: 4 days — Store in an airtight container.
Reheating: Toss in a hot skillet over medium-high heat for 2 minutes to revive the blistered texture.
Troubleshooting
The dish has an unpleasantly bitter, raw radish-like flavor.
Cause: The mustard oil was not brought to its smoking point before tempering the spices.
Fix: Cannot be fixed
Prevention: Always heat mustard oil until you see a thin wisp of pale smoke. This chemically alters the oil, mellowing the harsh flavors and leaving behind a savory nuttiness.
Mustard seeds taste burnt and ashy.
Cause: The oil was too hot when the seeds were added, or they were left in the oil too long before adding the beans.
Fix: Cannot be fixed
Prevention: Briefly take the pan off the heat after the oil smokes to let the temperature drop slightly before adding the seeds. Have the beans prepped and ready to add immediately after the popping stops.
Excessive splattering when beans hit the pan.
Cause: Water droplets remained on the washed green beans.
Fix: Reduce heat and step back until splattering subsides.
Prevention: Thoroughly pat the green beans dry with a clean kitchen towel or paper towels after washing.
Cultural Context
Mustard oil, known as sarson ka tel, is a foundational cooking fat in Eastern and Northern Indian cuisines, specifically in regions like Bengal and Punjab. Its sinus-clearing pungency acts as both a cooking medium and a dominant flavoring agent. By utilizing the ancient technique of tempering spices in hot oil, this dish transforms a modest vegetable into a vibrant reflection of traditional Indian home cooking.
