Panettone - mine's from Fellini in Hatch End. Fellini and the other Italian restaurants had parties for Xmas and New Year. How do you remember the spelling of Fellini and Penettone? 

FELLINI - SPELLING MEMORY AID

Fellini - double ll like legs eleven (as they call in UK Bingo halls). 

PANETTONE - MEMORY AID

Pan is bread in French. Pane bread in Italian. 

Panettone - think Pa-net-tone. Or Pa-nett-one. Pa-netto-ne. Pane-TT-one.

Or keep looking at the word and spell it aloud three times. There are two letters N, two letter E, two letters N, but the N is at both ends separated by the double TT. Pa-NE-TT-0-NE.