There comes a point in the life of many soups when they get a little sleepy.

This happens especially often with soups that are creamy, starchy or — blessedly — both. Everything is humming along just fine. The onions are soft. The garlic is fragrant. The spices have bloomed. You taste a spoonful and think, Hmm. So you add another pinch of seasoning. You taste again. Still: Hmm.

At this point, most of us instinctively reach for the salt.

But I’d like to gently intercept your hand on the way there and redirect it toward wherever you keep your vinegar. Some swear by the pantry, others insist upon the refrigerator; we will not allow ourselves to be distracted from our soup scholarship by these sectarian squabbles (at least not this week).

Because sometimes your soup doesn’t need more salt. It needs acid.

A small splash of vinegar at the end of cooking can give a tired pot an almost startling jolt. Vegetables taste brighter. Herbs seem greener. Starchy soups feel less pasty on the tongue. Spices that had faded into the background suddenly become legible again. Depending on how much you add, you might even get a delectable little Oh, what is that? pucker at the end of each bite.

I love lemon in soup, too. Sometimes I want the lemon flavor to be the whole point: a lemony avgolemono, for instance, or a chicken stew that tastes unabashedly citrusy. But lemon can announce itself loudly. Same with lime.

Vinegar can be more like a gentle wake-up than a glass of water to the face.

I first really understood this while making Alison Roman’s dill-packed potato-leek soup, published originally a little over five years ago, which finishes with white wine vinegar. Roman writes that the vinegar makes the soup taste “almost like a pickle.” I went into the recipe expecting exactly that, was delighted to find it delivered and started experimenting with the same trick in soups of my own.

The key here is finishing with vinegar. There are, of course, soups where acidity is built in earlier: Chinese hot-and-sour soups, borscht and various Eastern European sour soups all have their own traditions and techniques. But that’s a different lesson.

For our purposes, cook your soup until it’s essentially done. Then, before making the final salt adjustment, add about 1/2 teaspoon to 1 teaspoon of vinegar. Stir it in thoroughly and give it a moment. I actually like to step away from the stove at this point. Get some water. Wash a spoon. Pop my head out the kitchen window like a dog on a road trip. Then come back and taste again.

Vinegar is firmly in the category of ingredients that are easier to add than subtract. You’re not necessarily trying to make the soup taste vinegary. You’re waiting for everything else in the pot to suddenly taste more like itself.

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Different vinegars naturally play better with different soups. Red wine vinegar is wonderful with hearty lentil, bean and farro soups, and I love it in beef stew. It can also rescue a tomato soup that’s drifted too far toward sweetness.

White wine vinegar — or even plain distilled white vinegar — is excellent with potatoes, creamy chicken soups and corn chowders. Think of the logic of salt-and-vinegar potato chips: starch loves that sharp little counterpoint.

For sweeter, earthier soups made with squash or root vegetables, I tend toward vinegars with a little fruitiness of their own, like apple cider vinegar or my current favorite, white balsamic.

There are exceptions. I probably wouldn’t start splashing vinegar into a delicate seafood bisque. And broccoli-cheddar soup, for me, remains a no-fly zone. Not every pot requires intervention.

But many do.

I learned to cook thinking that “finishing” a dish meant adding enough salt and pepper. Then fresh herbs were a revelation. Acid was another one: a reminder that a finished dish doesn’t necessarily need more flavor so much as it sometimes needs contrast.

That’s especially true of this week’s soup: a hot honey carrot and sweet potato number built with garlic, onion, coriander, paprika, cumin, red pepper flakes and miso, then rounded out with savory stock and coconut milk.

Before the vinegar, it tasted good — but a little too sweet and a little too earthy. The white balsamic changed the geometry of the whole bowl. The sweetness of the vegetables became more nuanced instead of landing like a sledgehammer. The spices emerged. The stock tasted more savory. And instead of registering immediately, the hot honey left a gentle warmth at the back of each bite.

So that’s your homework for week two of Soup School: When your next pot tastes fine but somehow unfinished, don’t automatically add another shower of salt.

Add a little vinegar.

Let it sink in.

Then taste again.

For a while, I kept a soup journal.

Not a recipe journal, exactly. More like field notes. If I ate a soup I liked out in the world, I’d jot down what was in it, what the broth tasted like, sometimes sketch the bowl. I just adore the form.

Especially when I lived alone, it was not unheard of for all three meals in a day to be soup. One particularly triumphant day started with congee in Washington, D.C., continued with enchilada soup at an airport Chili’s and ended with pastina back home in my pajamas.

So, in honor of soup season, I’ve decided to spend the next few weeks of “The Bite,” Salon’s food newsletter, teaching what I’ve started referring to in my notebook at Soup School: a loose little series about the patterns that make soup better. We’ll talk about the ingredient your soup is probably missing — vinegar! — plus better soup toppers and, eventually, how to host a soup party.

Last Sunday night, my grocery order arrived without my usual breakfast sandwiches.

This ordinarily would not constitute a crisis. Except my little freezer stash of homemade breakfast burritos had also dwindled to nothing, and I knew exactly what Monday morning would look like without some intervention: Wake up. Realize there was nothing easy to eat. Debate whether I had enough time to stop somewhere. Get annoyed that breakfast had somehow become a decision I needed to make before coffee.

On busy weeks, I hate busy mornings.

Breakfast is consequently my most brainless meal. Give me something I can put in a 350-degree oven for a few minutes while I shower and become a person, and I am delighted. Weekends are different. On a Saturday, I will happily get up at 6 a.m. with coffee to babysit yeasted cinnamon rolls or start whisking hollandaise. The fuss is part of the pleasure.

Wednesday morning? Absolutely not.

So, standing in my kitchen Sunday night, I decided to give myself one nice thing.

I had two sourdough heels, two eggs and some cream, which meant I had the beginnings of either a sweet or savory strata. Savory sounded more like Monday, so I did what I think of as reverse-shopping: opened the refrigerator and started looking for ingredients that wanted to know each other. Half a can of diced tomatoes. Half a white onion. Four strips of bacon. A little shredded cheddar left from chili night. A jar of roasted red peppers.

Scrappy, yes. But coherent.

I whisked the eggs and cream with garlic powder, onion powder, dried thyme, oregano, red pepper flakes, salt and pepper, plus a little drizzle of soy sauce. Trust me. Then I added the tomatoes directly to the custard because I wanted the bread to soak up their sweet-savory juices rather than simply sit alongside them. In went the torn sourdough, which I thoroughly dunked in the custard, followed by crisped bacon, a small drizzle of bacon fat — sue me — cheddar, roasted peppers and minced onion. You could soften the onion first if you prefer, but I liked the little bit of bite it retained after baking.

The whole thing went into a greased 8-inch baking dish and into the refrigerator overnight.

Before bed, I also chopped one slightly wilting scallion and tucked it into a little bowl for morning.

This is perhaps the detail that best explains what I mean by “one nice thing.”

The next morning, I drizzled a little olive oil over the strata, put it into a 350-degree oven and went to shower. About 25 minutes later, I gave it another few minutes to brown, scattered my already-chopped scallions over the top and sat down to a breakfast that felt vaguely café-quality on a Monday morning.

It felt café-quality on Tuesday, too.

I’ve written before about my general resistance to rigid weekly meal prep. I’m much happier with an occasional Big Seasonal Prep Day — fill the freezer with soups, sauces, breakfast burritos and other useful things — and then let the ensuing weeks fall where they will.

But this fall, “one nice thing” has become something of a guiding star. It is a season in which a lot of energy is flowing out: two family weddings back-to-back, seven family birthdays between August and November, the usual work, a cookbook project, a documentary. When that much is going out, it feels especially good to do something small that preserves a little energy for me.

Importantly, “nice” is doing a lot of work here.

This isn’t about optimizing every meal, spending three hours prepping identical containers or constructing the sort of Sunday routine that makes you feel behind when you inevitably skip it.

It starts with a different question: What would make me disproportionately happy to discover already done tomorrow?

Maybe the answer is waking up and realizing you don’t have to hit the drive-thru for breakfast. Maybe it’s knowing you won’t have to pull out another knife for three days. Maybe it’s just opening the refrigerator and finding something cold and lovely to drink.

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Here are a few of my current “one nice things,” roughly in ascending order of effort:

• Put tea bags in a jug of cool water and refrigerate overnight. Cold-brewed green tea the next day feels disproportionately fancy for something that took approximately 45 seconds.

• Make one dip or dressing. For me, this is often cottage cheese ranch or a punchy vinaigrette — mostly because Future Me is considerably more enthusiastic about eating vegetables when there is something good to drag them through.

• Make one big batch of Very Simple Soup. I’ll be sharing some of my favorites over the coming weeks, but a pot of soup in the fridge can quietly carry several lunches without asking much of you.

• Put on a podcast or an episode of whatever you’re watching and chop the vegetables. I set up my cutting board at the bar in front of the television, clean and chop everything, then stash it in labeled deli tubs. Yes, in my personal estimation, making an entire batch of soup is easier than a dedicated vegetable-chopping session. Your mileage may vary.

• Make something that gets better while you ignore it. Chili. Curry. Baked pasta. A strata like this one. Something that can sit in the refrigerator for a day or two and somehow become more itself.

The point isn’t to prepare yourself perfectly for the week.

It’s just to put one small pleasure into motion.