For lasagna we cook the ragu etc for multiple times eating, then we prepare the glass boxes as if they went to the oven, but put them to the freezer.
Finishing this is basically: put the box from the freezer to the oven, then turn on the oven and bake for ~75minutes instead of the usual 60.
IKEA and DM (in Germany) have also nice glass boxes which are not as expensive as the Pyrex ones, but especially the cover of the Pyrex are better IMO.
For lasagna we cook the ragu etc for multiple times eating, then we prepare the glass boxes as if they went to the oven, but put them to the freezer. Finishing this is basically: put the box from the freezer to the oven, then turn on the oven and bake for ~75minutes instead of the usual 60.
IKEA and DM (in Germany) have also nice glass boxes which are not as expensive as the Pyrex ones, but especially the cover of the Pyrex are better IMO.