spaghetti alla botarga
Menupages.com has a find-a-food search feature and if you type in "botargo" it lists 20 or so results. Otto, Peasant, Perbacco and Cacio e Vino are some of the restaurants on the list...granted I don't know if they have that exact dish on their menus.
234 East 4th Street, New York, NY 10009
Cacio e Vino
80 2nd Avenue, New York, NY 10003