What spices would you add to boring pasta sauce from a jar?

It can be, but then you’ve got Cincinnati chili sauce. Which is not a BAD thing. If you like that, add a touch each of cinnamon and cocoa. Serve over spaghetti and top with beans, meat, onions, and shredded cheddar cheese. (Just google “Cincinnati Chili”)

I would avoid oregano, myself. Bensonhurst guidos deplore it as overly Greek, and prefer lots of basil, parsley, and garlic.

If you’re buying “bland” jarred spaghetti sauce, save money and buy a can of plain whole or crushed tomatoes. Season to your own taste.

I throw 3 dashes of Cayenne into pasta sauce, pizza sauce, pretty much any tomato based sauce for a background little kick of flavour.

Some vegemite or marmite dissolved in hot water adds a nice beefy umami flavor.

Minced kalamata olives with capers do it up nicely too.

Lemon juice is favored in my house also.

Tossing in the intact rind from a wedge of parmesan to simmer for a while adds awesome flavor. But pull it out before serving.

Sometimes a touch of fish sauce or worchestershire can be lovely.

Try using mexican oregano (a wholly different spice than oregano) if you want to get wild and crazy.

Caramelize a few tablespoons of tomato paste in the pan as you sear the other ingredients of your sauce, it can add a lovely smoky flavor.

Otherwise, I also agree with a lot of the earlier suggestions in this thread.

I find cumin counteracts the excess sweetness in commercial sauce while brightening it up a bit (hard to explain). That plus added ground beef cooked with onions can be quite good. And I loath Cincinnati sauce - I had family from there. Give it a try. Many jar sauces are over spiced, it’s difficult to get a bead on what to add without making things worse.

My go-to is to cook bacon, drain off some of the grease for future use (can be used instead of olive oil), add some minced garlic to soften. Add desired amount to jarred sauce, along with a pinch of cayenne pepper or flakes. Add fresh basil at the end.

Which reminds me. I forgot to buy a basil plant at the store. I wasn’t expecting them to be on sale, since plants are generally not allowed to be sold. I guess there’s an exception for herbs.

It’s also nice to fry up a diced fennel bulb, in place of onion, for a pasta sauce. A milder, sweeter aniseedy tang.

I like to add a stalk of fresh rosemary. I’m afraid to add oregano, my mother, a first generation Sicilian whose parents came from a village on the slopes of Mt. Etna would have slapped me into next week if I’d added oregano to pasta sauce. Her firm policy was that oregano went on sliced fresh tomatoes and pizza, that was it. She’s been dead for close to ten years, but I figure why take a chance?

I sometimes add a couple of spoonfuls of Marconi muffaletta mix or giardiniera to a pasta dish.

Besides some kind of ground meat, a splash or two of some cheap red wine. That makes Ragu extra fancy.

Yes to pretty much all of the above. Dice up a named meat. Red pepper flake, cheap wine, basil, oregano, marjoram, a little fennel seed and Robert’s your mother’s brother.

My wife (Annunciata Maria) says:

Green peppers
Fresh onion
Fresh garlic

Basil is good and some chopped carrot and celery for body.

The effect of adding fresh garlic cannot be underestimated

And that does not mean, throwing whole or roughly chopped cloves into the sauce and then heating it up; quite the opposite.

You want to heat some olive oil over medium heat, add the garlic first until the smell of it is well released, then add the onions and peppers. Only after the onions are browned and the peppers are softened do you add the sauce from the jar, stir, add some fresh basil if you have it, and cover and simmer until the sauce bubbles gently.

If you are adding ground beef, drop the beef in there after the onions/peppers are softened but before adding the sauce. Add a bit of salt and black pepper at that time if you’re adding unseasoned meat.

Anchovy paste for umami can also kick things up a notch, or if you don’t have that, just use a pinch or two of Accent. Which is MSG. Which is umami. No worries.

Definitely fennel. Preferably seeds, but ground fennel works, too. And I always add a few dashes of Tabasco after cooking but before serving.

Heh, my second grade teacher was Sister Annunciata Maria.

I like adding basil. Especially fried fresh basil leaves on top when you’re plating. Second adding a little anchovy paste. You don’t “taste” it per se but it adds that depth of umami.

I’ve never added fennel because my sister (who I live with) doesn’t like it. One day I’ll make a batch for me and add sauteed fresh fennel. Yum!

Honestly? Most of the commercial sauces are way over-spiced to begin with. I’d rather start with a can of absolutely plain tomato sauce. But, if you want to jazz it up, oregano and garlic are probably the two most common ones to try to start with.

OK, here’s the best move: get yourself to a Mariano’s or whatever (I’m pretty sure you’re in my area). Get some proper Parmigianno-Reggiano – it’s not even all that expensive. You just want the shit that has the stamp on the side. Theirs is branded as “White Gold” IIRC. Use that, grate it, put that on your pasta, and you will be good.

Really? The uninitiated need to be careful - very careful - if doing things in this order. You can burn garlic into acrid bitter pellets of grit in considerably less time than it takes to get colour into onions and soften peppers. And browning onions is a contentious issue in its own right. Marco Pierre White - Italian mother, three Michelin stars - says to cook them without colour. Plenty of others - Italian Nonnas among them - will probably tell you otherwise though…

Anyway, back to where garlic sits in the order of play: the liquid released from the onions and peppers can buffer the garlic against scorching, but it’s a great deal safer to add your garlic for a couple of minutes after the - far more forgiving - onions and peppers are getting to where they need to be.

Fresh basil though - yep, down with that. And a decent twist of black pepper, I reckon.