Equipment
Ingredients
Main
- 400 g green beans, trimmed and halved
- 30 ml mustard oil
- 6 g black mustard seeds, whole
- 2 dried red chilies, whole
- 4 g kosher salt
Nutrition (per serving)
Nutrition is estimated per serving. Nutrients without complete source data are omitted.
Full nutrition
- Calories
- 104 kcal
- Protein
- 2 g
- Carbohydrates
- 8 g
- Fat
- 8 g
- Fiber
- 3 g
- Sugar
- 3 g
- Sodium
- 394 mg
- Saturated Fat
- 1 g
- Monounsaturated Fat
- 4 g
- Polyunsaturated Fat
- 2 g
- Potassium
- 222 mg
- Calcium
- 37 mg
- Iron
- 1.0 mg
- Magnesium
- 25 mg
- Phosphorus
- 38 mg
- Zinc
- 0.2 mg
- Vitamin A
- 35 mcg
- Vitamin C
- 12 mg
- Vitamin E
- 0.4 mg
- Vitamin K
- 43 mcg
- Vitamin B6
- 0.1 mg
- Thiamin
- 0.08 mg
- Riboflavin
- 0.10 mg
- Niacin
- 0.7 mg
- Folate
- 33 mcg
- Water
- 90 g
Sources: Aggregated Public Data, USDA FoodData Central
Method
Wash the green beans thoroughly and pat them completely dry to prevent splattering later. Snap or cut off the stem ends, and slice them in half if they are exceptionally long.
Place a wok or large heavy-bottomed skillet over medium-high heat. Pour in the mustard oil and heat until wisps of white smoke appear, which occurs around 250 degrees Celsius or 480 degrees Fahrenheit. This crucial step burns off the raw, bitter edge of the oil. Once smoking, remove the pan from the heat for 30 seconds to let the oil cool slightly.
Return the pan to medium heat. Add the black mustard seeds and dried red chilies. The seeds should immediately begin to sizzle and pop. Let them fry for 10 to 15 seconds until they are fragrant and the popping slows down.
Add the prepared green beans and kosher salt to the pan. Toss quickly using tongs or a spatula to coat the beans evenly in the spiced oil.
Stir-fry the green beans continuously for 5 to 7 minutes. Look for the skins to slightly blister and wrinkle. The beans are ready when they are bright green and tender-crisp. Remove from heat immediately to prevent overcooking.
Chef's Notes
- Mustard oil has a very high smoke point and a distinctively sharp, pungent flavor similar to horseradish or wasabi. It is essential to heat it until it smokes to mellow its raw intensity.
- Drying the green beans completely before adding them to hot oil is critical. Any residual water will cause violent splattering and steam the beans instead of blistering them.
- If you prefer a milder side dish, you can substitute half of the mustard oil with a neutral cooking oil, though you will sacrifice some of the traditional pungency.
- Keep a lid handy when adding the mustard seeds. If they pop too aggressively, you can shield the pan momentarily to keep them from flying out.
Storage
Refrigerator: 4 days — Store in an airtight container.
Reheating: Flash fry in a hot skillet for 1 to 2 minutes until just heated through, or microwave in 30-second bursts.
Troubleshooting
Mustard oil tastes intensely bitter and burns the throat
Cause: The oil was not heated to its smoking point before adding ingredients
Fix: Cannot be fixed
Prevention: Always heat kachi ghani mustard oil until it smokes heavily, then cool slightly before cooking
Green beans are limp and soggy
Cause: Pan was overcrowded or heat was too low
Fix: Cannot be fixed
Prevention: Use a wide skillet and ensure the heat remains medium-high to blister rather than steam the beans
Cultural Context
Mustard oil and black mustard seeds are foundational elements in the cooking of Eastern and Northern India, particularly in Bengali cuisine. The technique of tempering whole spices in hot oil, known as tadka or chaunk, unlocks the fat-soluble essential oils of the spices, delivering intense flavor to simple vegetable dishes.
