How is this lasagna pasta supposed to be cooked?
Barilla say their lasagne is no-cook (not all lasagne is), so I can only assume they expect you to make your béchamel with 900ml milk, then use a jar of their bolognese sauce in the alternate layers. It's a tad lacking in precision, for sure.
Personally, i'd just search a no-cook lasagne recipe online, as the liquid balance is pretty important for lasagne - too much &amp; it's like soup &amp; slime, too little &amp; it's a brick.
I just checked Barilla sites &amp; recipes around the world, most Barilla is no pre-cook - it also says that on your box - only their wavy lasagne is pre-cook.