Flaky, all-butter golden pastry filled with a delicately spiced sweet filling, baked until crisp and aromatic.
Whisk the flour, water, salt, and egg into a smooth, lump-free batter the consistency of thin cream; rest for 30 minutes.
Set a large flat tawa or nonstick frying pan over medium-high heat and rub lightly with ghee.
Pour a ladle of batter and spread it with the back of the ladle into a paper-thin disc.
Cook until the top dries and the underside develops crisp golden patches, about 1-2 minutes; do not flip.
Drizzle each regag with ghee and fold; serve warm with date syrup alongside biryani.