Prepare your lasagna sheets, about 12 should be enough. Check if they need to be boiled first, or if they can be used as is. It is normally indicated on the box. If they need to be boiled ...
Thinly slice the celery and dice the carrots. Put the minced beef in a large non-stick frying pan with the sliced leeks, chopped onion, celery, carrots and garlic. Place the pan over a medium-high ...