Step 1: Prepare the Vegetables

Shred the cabbage using a mandoline or a knife. Peel the potatoes, slice them, and then chop them into 1cm cubes.

Step 2: Temper the Spices

Heat oil in a large pan or wok over medium-high heat. Add the mustard seeds and let them crackle. Then add the cumin seeds, asafoetida (hing), and minced ginger. Sauté for a few seconds until aromatic.

Step 3: Create the Masala Base

Add the pureed tomatoes to the pan, followed by the ground turmeric, chili powder, salt, and sugar. Stir well and cook for 2-3 minutes, until the mixture comes to a gentle simmer and the oil begins to separate from the tomatoes.

Step 4: Add Vegetables and Stir

Add the diced potatoes and shredded cabbage to the pan. Stir everything together thoroughly to ensure the vegetables are evenly coated in the tomato masala.

Step 5: Steam with the Ice-Lid Method

Cover the pan with a lipped lid or a large plate that fits snugly. Place a handful of ice cubes on top of the lid. Reduce the heat to low and let the curry cook for about 15-20 minutes, stirring once at the 5-minute mark. The melting ice will create steam, cooking the vegetables in their own juices.

Step 6: Final Stir-Fry and Garnish

Once the potatoes and cabbage are tender, remove the lid. Increase the heat to high and stir-fry for 1-2 minutes to evaporate any excess moisture. Add the chopped green chilies and fresh coriander, give it a final stir, and serve hot.

• If preparing potatoes in advance, soak them in cold water to prevent them from turning brown.

• Use the ice-lid method for a dry-style stir-fry curry. The condensation from the melting ice steams the vegetables in their own juices, preserving natural flavors without adding extra water.

• After steaming, do a final stir-fry on high heat to evaporate any excess moisture and lightly brown the vegetables for extra flavor.

• Any white or green cabbage can be used.

• You can use fresh or frozen minced ginger.

• Canned or fresh tomatoes can be used for the masala base.

• If you don't want to use the ice-lid method, you can cook the curry with a traditional lid.