This mystery dish we showed you yesterday is the wonderful blood sausage (morcilla) in tomato sauce at Despaña, the Soho Spanish specialty foods shop that has recently expanded its cafe.
Commenter Hoi correctly guessed both the place and the dish. Congratulations, and please email me so I can let you know which books you have to choose from.
Check back here next week for another Where Am I Eating? contest.