Ghee roast dosa is the Karnataka version of the fermented rice-and-lentil crepe, cooked in a generous pour of ghee until it goes deep, brittle, glassy crisp. The base batter is the standard dosa ferment, a thin pour of soaked rice and urad dal left to sour overnight, which gives the crepe its faint tang and its lace. What changes here is the fat and the patience: where a plain dosa is cooked on an oiled griddle, this one is bathed in ghee and roasted longer, so the result is darker, harder, and aromatic with browned butter rather than soft and foldable.
The build runs on the griddle in order. A ladle of fermented batter is spread thin in a spiral across a very hot tawa, the spiral worked outward fast so the crepe is even and full of small holes. As it sets, ghee is drizzled around the edges and over the surface, repeatedly, so the dosa fries rather than just dries: the lace browns, the edges lift and shatter, and the whole sheet takes on a toasted, nutty smell. A spiced potato filling, the Karnataka style often hotter than the Tamil one, is laid down the center and the crepe is folded or rolled around it. Good execution is a dosa that is genuinely crisp across its whole span, a controlled mahogany rather than burnt black, the ghee read as toasted and clean. Sloppy execution is a dosa that is crisp at the rim but raw and doughy in the middle from too little spread or too little fat, a bitter scorched flavor from ghee taken past browning into burning, or a greasy, heavy crepe from fat poured on without enough heat to crisp it.
Variations are mostly in the filling and how dark the roast goes. Some cooks push the potato spicing hard with extra chili and curry leaf; others keep it gentle so the browned ghee leads. A plain ghee roast with no filling, eaten with chutney and sambar, is the austere version that puts the whole weight on the crepe itself. It is always served with coconut chutney and sambar, the cool and sour against the rich crisp. The plain masala dosa, the thick set dosa, and the conical paper roast are each their own preparation and deserve their own article rather than being crowded in here. The constant is the ghee and the long roast that turns the crepe to glass.