I use the recipe on the lasange box as a guideline and then add other things that we like as in extra garlic, lots of sauce, a little spinach in the cheese filling, etc... I don't think I ever follow a recipe to a tee...I adjust a recipe to our taste.
I make marinara sauce about once a week at my house. I double the recipe and keep some stored in the fridge. My family loves it.
The basics for my sauce are listed below. I add/delete things to flavor to our taste.
1 chopped onion, 2 med carrots (finely chopped), 2 cloves garlic (chopped), 1 stalk celery (chopped) 2 Tbls olive oil, 1 can of crushed tomoatoes, 1 tsp sugar, 1tsp salt, 1 tsp dried oregano, dash crushed red pepper, little cayenne, fresh basil
Cook onion, carrots, celery, garlic in hot oil until tender (not brown), add tomatoes, sugar, salt, oregano, pepper, basil. Bring to a boil, reduce heat, simmer uncovered about 45 minutes or to the constistency you desire.
I also make Hot Italian Sausages from Hirsch's Meats to go with the marinara.
Good luck!