Good call! In fact, you might have had problems with customs with the Marzipan. I had problems with a similar "Turrón" which, this particular kind, was like thick peanut butter. They took mine in NY Airport. The "mermelada", being a kind of liquid, MIGHT call attention at US customs, too. Hope not.

If you're looking for sit-down restaurants, you could order a couple "raciones" at some of the less touristy Calle de las Conchas - where I enjoyed raciones and wine at three different terrzas. Let's see, I think I paid nearly 18 Euros for an 8-piece "ración" of fat "Croquetas" and 4 (total) glasses or Rioja red wine. (that terraza was actually on the Calle Postigo San Martín) Not sure if that's expensive or not. You'd have to order something else to really make that meal, so maybe 30 Euros total?

Have a good flight back!

Saludos, MadridMan