You're in luck, I went grocery shopping las saturday so I have options.

I could make some version of rissotto alla milanese, there's also pasta and I could probably improvise a decent tomato sauce.

But since It is for dinner I would go with "bocata de lomo con queso", that a quick internet search tells me that in English would be a pork loin with cheese sub.
The bread opened lengthwise, slightly toasted. Garlic and tomato rubbed on the inside, since I don't have rubbing tomatoes I would improvise with diluting some concentrated tomato paste, olive oil and salt. Then pork tenderloin, cheese and glazed onions. And oregano.