1. Slit the potatoes crisscross, without separating them in two part. Do not take the skin out!

2. In a large wok, heat the oil, add mustard seeds until sputters, add potatoes and onions with 1/8 cup water, and turmeric. Stir occasionally over medium-high heat until potatoes are tender half way.

3. Now, add tomatoes and Lasaniya Marchu, continue to stir occasionally until potatoes are tendered.  Let it simmer until the tomatoes are softened.

4. Garnish with cilantros.