First I made the Bolognese...
here to get the recipe. I think the longer you can cook this the better. The flavors will get infused deliciously and the carrots will get nice and soft. You will have leftovers. I let it cool and then put my extras in a freezer bag for another lasagna...or Spaghetti.
Next I boiled my lasagna noodles al dente then was ready to assemble. I don't really think there is a wrong way of assembling, or a set pattern to follow. Just do what makes sense to you. I put some béchamel at the bottom of the dish, then noodles, then more béchamel, then sprinkled cheese, then bolognese, then noodles, then béchamel, bolognese, cheese, noodles, béchamel, bolognese, cheese, noodles, béchamel, cheese. Bake at 350 for about an hour. I would keep it covered until the last 20 minutes.
I wish I would of snapped a pic of the finished product before we devoured it...But i didn't. As you can see it was very much devoured, and enjoyed :)