Saag is winter in Punjab. When the mustard fields turn yellow in November, sarson ka saag appears on tables across Pakistan and India — from roadside dhabas to wedding feasts. It is one of the few dishes where the cooking time is measured in hours and the ingredient list is almost entirely vegetables, yet the result is deeply satisfying and richly complex.
The correct greens are sarson (mustard), spinach, and optionally bathua (lamb's quarters) or fenugreek. The bitterness of the mustard greens is essential — do not substitute with all spinach, as the result will be sweet and flat. The long cooking and the final ghee tarka are both non-negotiable.