We detected a wave of excitement fluttering through San Francisco when news broke that the Mission District was going to be home to a new Indian called Dosa, devoted to cuisine from the South of the country. S is for Scarce, which describes the presence of this cooking style in the city until now. The Chronicle's Amanda Berne visited Dosa just a few days after it had opened, reported it in the What's New section and from that moment onwards its success seemed assured. Even people who don't normally seem to be that interested in dining out were asking us if we'd heard of this much talked-about new place. Barely a week old, Dosa was already buzzing.