Analysis of information sources in references of the Wikipedia article "Lasagna" in English language version.
... in referring to baked versions of the dish, regional usage in Italy favours the plural form lasagne in the north and the singular form lasagna in the south; from the former usage stems the British use of 'lasagne' and from the latter the American 'lasagna'. Neither usage can be considered 'more correct' ....
Thys fourme of cury ys compyled of þe mayster cokes of kyng Richard þe secund ... by assent of Maysters of physik and of phylosophye.