I make my own spaghetti sauce from my DH's family...
1 27 ounce can of tomato sauce (or 2 15 ounce cans)
1 TBSP of Italian Seasoning
2 TBSP Sugar (I know not good for you, but I use the organic stuff... has to be better right

)... it cuts the acidity of the tomatos and makes it taste SO good
1 TBSP of onion powder or granulated onion (DH hates onion chunks)
2-4 gloves of garlic finely minced or pushed through a garlic press
2 TBSP (or so) of olive oil
Put all ingrediants in pan and stir- heat till bubbling then reduce heat and simmer for at least 20 minutes... I usually start the sauce then start the water for the noodles and by the time the noodles are done, sauce is ready.
Add meat as desired (Italian sausage, hamburger, ground turkey/chicken) 1/2 to 1 lb is plenty.
Also makes a good pizza sauce, if you reduce sugar to 1 TBSP and then add an additional tsp or so of Italian seasoning, and heat until sauce is thickened up (you can "plop" some sauce on top of what's in the pan and the indentation stays).
DH makes Lasagna a couple of times a year, I make a garlic sauce we serve with noodles and chicken (basic white sauce with garlic and romano cheese added).
For mexican, I make tacos, fajitas, enchiladas, quesadillas, and a meat and potato quiche with taco meat. I used to make tamale pie, but DH hates it so it's no longer on the menu.