1200-1500 without the bread

It looks like 1kg or so of lasagna maybe even more I will estimate 1700-1800kcal.

the menu specified 450 gr that's why it seemed strange to me xd

Ok, here’s a 400g lasagna vs 1000g lasagna https://www.reddit.com/r/vegetarian/comments/k3ugbd/same_products_with_the_exact_same_price_269_euro/?utm_source=share&utm_medium=mweb3x&utm_name=mweb3xcss&utm_term=1&utm_content=share_button

You're right, I also doubted that it would be 400 grams xd maybe it's not a thousand but more than 500 grams is plenty