I will try to do lasagna and I have doubts about how to deal with the pasta. The bolognese and bechamel sauces are fine (at least I know how to approach them).
The problem I am having is with these "pre-cooked" lasagna pasta sheets (this is in France, Barilla is a very common brand of pasta over here)
Instead of a written description of how to use them, they only went for a few icons:
What does the first icon mean?
It could be a part of the bechamel sauce recipe, but it misses everything else (the roux, etc.).
Am I supposed to boil 0.9L of milk, pour it in the flat bowl, then put the sauce (I cannot believe that, maybe a first layer of pasta on top of the milk? – still does not make a lot of sense) and then the layers of bechamel and sauce?
In other words: where does this 0.9L of milk go?
EDIT: on The French Barilla site they have a section with recipes, including a few lasagnas using the pasta I have. https://www.barilla.com/fr-fr/recettes/collezione/lasagnes-a-la-sauce-napoletana-et-legumes-grilles for instance mentions milk only in the context of the bechamel sauce.
FINAL EDIT: I got a message from Barilla telling me that the first icon is "the recipe for bechamel"… Well never mind. I had the bolognese sauce done my own way and I used a 50 g flour + 50 g butter (roux), + 0,9L milk and the texture & amount was perfect. Thanks everyone.
Best Answer
I found written instructions for how to use this pasta on the Barilla website. They are pretty much the same as you have interpreted the iconic instructions, which is to say, it's not a full recipe.
On a separate page with "tips and tricks" for preparing lasagne, they have these instructions for using the precooked lasagne sheets:
They also have these Q&As:
These Q&As seem to refer to the 9oz (255g) box size available in the US. So for your 500g box, you would want double the recommended amount of sauce. For red sauce, use at least 48 oz (1.4 L) of sauce for 255 g of pasta or 96 oz (2.8 L) of sauce for the full 500 g box. For white sauce (bechamel sauce), use 1.4 L to 1.9 L for half the box, or 2.8 L to 3.8 L for the full box.
Barilla provides several recipes for their pre-cooked lasagne sheets here.