Both "lasagna" and "lasagne" are correct spellings of the same dish. However, their usage can vary depending on the region and language. In American English, "lasagna" is the more commonly used term and refers to both the singular and plural form of the dish. So you would say "I ate a piece of lasagna" or "I made lasagna for dinner." In British English and Italian, "lasagne" is the preferred spelling and is used for the plural form. When referring to a single piece or serving of the dish, the term "lasagna" is used. For example, you would say "I had a slice of lasagna" or "I cooked lasagne for the party." Ultimately, both spellings are correct, and it's a matter of personal preference or regional convention.