The spaghetti that was being scrapped into the garbage in the montage in GF I, and the spaghetti Connie threw at the wall in GF I. The spaghetti Vito, Tessio and Clemenza were eating in GF II when Vito told them about his plan
The pear in GF II.

Whatever it was Apollonia was passing around at her wedding.
Some kind of candy I think.

The OJ and candy Michael ate in the cardinal's courtyard.

The Pope's tea.

Hyman Roth's Birthday cake in Cuba, and his tuna sandwich in Miami.

The bag of Groceries Abbandando tried to give Vito.

The salsice Joey Zasa ate at the street fair.

The best veal in the city.

What were Hagen and Woltz having for dinner?

What were Michael and Kay eating at the hotel?

What were they having in GF II in the scene where Merle and Deanna were dancing?