If you’ve ever tossed an almost-empty jam jar in the trash, you’re not alone. Those last streaks clinging to the sides can feel impossible to scrape out—and they usually end up wasted. But TikTok recently reminded us that what’s left behind isn’t garbage at all. With just two pantry staples, you can transform those sticky remnants into a restaurant-worthy vinaigrette in under a minute.
This viral trick works especially well with blackberry jam. It’s rich, slightly tart, and loaded with natural pectin that helps emulsify the dressing. Add a little oil, a splash of vinegar, and a good shake—and suddenly, you’ve got a gourmet salad dressing without dirtying a single bowl.
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The Two-Ingredient Jam Jar Hack
Here’s how to do it. When you reach the bottom of a jam jar, don’t rinse it out. Instead, pour in a few tablespoons of avocado oil and a splash of balsamic vinegar. Close the lid tightly and shake until the ingredients mix into a glossy vinaigrette. The oil and vinegar loosen up every bit of jam, giving you a perfectly balanced dressing with sweetness, tang, and body.
You can add in other vinegars or oils depending on what you have on hand—red wine vinegar for sharper flavor, apple cider for a fruitier finish, or olive oil for a rounder taste. The sugar from the jam balances the acidity of the vinegar, while the oil brings everything together into a silky texture.
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What to Do With the Last Bit of Jam
That near-empty jam jar still has plenty of flavor left—you just have to know how to use it. Instead of rinsing it out, pour in a splash of bourbon or whiskey, swirl, and you’ve got a quick cocktail mixer that adds depth and color to an old fashioned. The same trick works with sparkling water or seltzer for a quick flavored spritz.
You can also repurpose the jar into a meat or veggie glaze—add a bit of soy sauce or hot honey, shake it up, and brush it over grilled chicken or roasted carrots. For a quick breakfast use, add Greek yogurt or overnight oats straight into the jar, stir, and finish it off.
Even in the kitchen, that last bit of jam still has legs. Whisk it into a pan sauce for pork or salmon, stir it into balsamic reduction, or save the jar for homemade marinades. When you stop seeing the empty jar as trash, it becomes one of the smartest tools in your kitchen—and maybe your bar, too.
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