Lasagne are a type of wide, flat pasta, possibly one of the oldest types of pasta.
Lasagne, or the singular lasagna, is an Italian dish made of stacked layers of thin flat pasta alternating with fillings.
Heat and gratin in the conventional oven.
Preheat your conventional oven to 400 degrees Fahrenheit. Remove the plastic lid and cover it with aluminum foil (the container is for a conventional oven). Bring the lasagne to the preheated oven straight from the freezer. Heat for 45 minutes. Remove the aluminum foil and grill until golden brown.