For me, super simple meat sauce :
mince browned in pan with some milled pepper added, and maybe some crushed chilli flakes.
Add 2 tins of chopped tomatoes (or 1x peeled plum, 1x chopped)
Simmer for a bit.
Add a full tube of tomato purée and stir in
A glug of olive oil and a good amount of your preferred herbs.
Can add a spoon of sugar at this point too if you want as it counters the bitterness of the tomatoes (esp peeled plum ones)
Then multiple layers of sauce, a couple of dribbles of bechemel (or dolmio lasagne sauce) over the sauce you’ve put in, then pasta layer over it.
Repeat till top layer of pasta laid, then cover completely with your bechemel. Grated cheese over the top and cook in the oven.
Then eat some, put the rest in the fridge and the following day it’ll be even better…. Waaay better.
Lasagne is definitely better the day after, and to be best you want the sauce made to be reasonable watery rather than thick. That way the liquid gets absorbed overnight by the pasta layers and you get that really soft wavy layer.
Veggie version:
Instead of meat, chop up veg into chunks, drizzle in olive oil and roast on tray in oven.
Make up tomato sauce bit , and add the roasted veg last.
Then build up in normal way.