Tomato Uttapam is a thick South Indian rice-and-lentil pancake with tomato pressed into its top as it cooks. The angle is the topping baked in rather than laid on: this is not a thin crisp dosa but a soft, spongy uttapam where chopped tomato, and usually onion and chili, become part of the surface, half-griddled, sweet and slightly charred. It is a tiffin dish, eaten warm off the tawa with chutney and sambar.
The make rests on the batter. The same fermented batter used for dosa, ground rice and urad dal soaked and left to ferment overnight, is poured onto a hot greased tawa but spread thick and small rather than thin and wide. Before the top sets, the cook scatters finely chopped tomato, onion, green chili, and coriander across it and presses them down gently with the back of the ladle so they embed. Oil is drizzled around the edge, the pancake covered for part of the cook, then flipped briefly so the tomato side caramelizes against the heat. Good execution is an uttapam with a soft, airy, well-fermented interior, a lightly crisp base, and a topping that has cooked into the surface so the tomato is jammy and the onion sweet rather than raw and loose. Sloppy execution is a dense flat disc from flat unfermented batter, a soggy middle where it was spread too thick and undercooked, or a topping that slides off in a wet pile because it was never pressed in or given heat.
Variations are mostly about what joins the tomato. Onion uttapam, mixed-vegetable, and a podi-dusted version are all common, and some cooks add grated carrot or capsicum alongside the tomato for color and crunch. The batter itself can be cut with semolina for a quicker, no-ferment version with a different, denser texture. It is served the same way across all of them, with coconut or tomato chutney and a bowl of sambar, the soft pancake doing the soaking. The thin crisp dosa and the steamed idli are made from a close cousin of this batter but are entirely different textures and deserve their own article rather than being crowded in here. Judged on its own, a good tomato uttapam comes down to two things: a properly fermented, springy body, and a topping that is cooked into the pancake instead of sitting wet on top.