Everyone, thanks for your contributions!
OK, first of all, the lasagna went great… or it WILL go great… Papa came home, saw me slaving away in the kitchen, and suggested it might be a good idea if I prepared the lasagna for baking tonight, so I can bake it and we can eat it tomorrow night. I was too hot and tired to whine or object. So we had chow mein tonight.
BUT I did prepare and assemble it, and it was fun! I grated about six tons of cheese, made sauce from scratch (yay!), and made quite a mess of the kitchen, but it was worth it. My masterpiece is in the fridge. I can’t wait.
horowitz, I tried to go with your sauce recipe as much as possible, except I had to use pork instead of sausage. I hope the deviation doesn’t affect it much. As it is, it tastes wonderful and the kitchen smelled great all afternoon. Thanks again for passing it my way.
KimKatt, I’m definitely going to use mushrooms next time around. Thanks for the tip.
Ukulele Ike, tried to get veal, but alas… I did get pork and beef, though. And the pasticchio sounds good! Thanks for passing it on.
Jack Batty, we had Lasagne Hamburger Helper in the cabinet. Ordinarily I like the stuff very much, but since I was trying to make the stuff from scratch, I felt obligated to ignore the thing. 
JoeyHemlock, the only yellow onions we have here are Maui yellow onions. I used a small one. Again, I hope the substitution works.
The ricotta I got was in a tub, and it was mixed with herbs and stuff. It smelled pretty good. I used it between the bottom layer of noodles.
lee, tater, thanks for keeping the tips coming.
Chronos, please do pass it on! I sometimes live for weeks by the microwave. Hey, I’ll bring it to your next post party!
sigh And DRY, if you want some, get your butt over here. I invited everyone. As Rich Eisen often says during baseball highlights, “Those who are late do not get fruit cup.”
tater, no apologies needed. I know DRY and his MO. So tell me, what’s with this Shrimp Boy thing? Is it something I can use against him?