Soak the gundruk in water for a few minutes, wash and squeeze out excess water.
Meanwhile, heat a deep cooking pan/pot and add oil — once the oil is hot, sauté garlic, onions, ginger, chilies and tomatoes. After 5 minutes, add turmeric powder, red chili powder, salt, the gundruk and potatoes. Sauté for another 2-3 minutes.
Add 6 cups of water and let the jhol come to a boil; simmer for 10 minutes (or until the potatoes are soft).
Garnish with chopped cilantro leaves and serve.