We’re cooking the sauce that will let us assemble a nice lasagna in 30 minutes come Christmas Day.

Today is the day I cook spaghetti sauce. Because I’m having a nice Christmas dinner, but I’m not spending the day cooking, eh?
The sauce: 2-3 lbs of ground beef (can use Italian sausage)
browned with (we are living dangerously on our lily-family allergy, but we can tolerate a little garlic IF it is fresh, never powdered) garlic in olive oil, in Crockpot.
2 cans tomato sauce, 1 can tomato paste.
water.
Teaspoon each of salt, black pepper, sage, powdered thyme.
Tablespoon each of basil, oregano
[this Middle Eastern part I add: others might not like: teaspoon each powdered clove and cinnamon. And a dash of powdered cumin.]
Mushrooms diced.
Cook all day.
The resulting sauce can be frozen with no great loss of quality. Freeze some, use some. Save some for Christmas lasagna. Like the Mexican base of taco meat, you can combine this with other things to produce good food fast: use with spaghetti, ravioli, penne in a casserole, you name it. Serve with an Italian or Greek salad, or Caesar salad. Meat, bread, veggie all in one dish, with no more fuss than boiling pasta, then baking the cheese done, so you can actually enjoy your own party.

Making lasagna. Boil water. Plenty of water. Cook lasagna strips. Barilla makes a good one. Be very careful extracting these, because these strips are somewhat delicate.
Heat oven to 350.
Lay a ‘bottom of lasagna strips in a square pan. Top with mozzarella. This makes a bottom that will stick together.
add warm spaghetti sauce, spread out evenly.
Add crumbled or diced ricotta (if you can’t find this mild cheese, use drained cottage cheese, but ricotta is better)—some add fresh chopped parsley to the ricotta. Smooth this layer out.
Add another layer of pasta.
Then repeat the layering of mozzarella, then sauce, then ricotta, then pasta as deep as your pan is tall. Make your final layer mozzarella cheese, pop into oven some 30 or so minutes (depending on size) before you want to serve. Bake until top cheese browns and bubbles. After all—all you’re doing in this cooking is melting cheese and heating through. Just be sure to get it heated all the way through.
Enjoy.