Old empty jars are a hot commodity in my mother's kitchen. Mayonnaise jars, pickle jars, spaghetti sauce jars, peanut butter jars, jelly jars, jar jars... if it's glass and has a screw-top lid and is almost empty, chances are that my mother will soon rinse out any remnants and set the jar aside for another use.
For instance, the ol' lass has been known to pour cooled bacon grease straight from skillet to mayo jar (though she also sometimes uses an old coffee can for grease containment). My mother has also taken to the practice of pouring some oil and vinegar into a jar, screwing on the lid, and then shaking the bejeebus out of the jar to make a simple vinaigrette (I'm not sure that my mom owns a whisk).
However, perhaps the most common purpose for my mother's repurposed jars is in the containment of Spicy Filipino Vinegar: vinegar that has been infused with Siling Labuyo (Thai chili/Bird's eye peppers). This fiery concoction is also known as Sili Suka, Sukang Sili, Suka't Sili, and/or Sinamak (I didn't know of the Sinamak nomenclature until some readers commented on it in my last post on Filipino Vinegars).