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Do you struggle to perfect your homemade cold brews? Even if you use perfect beans and have good roasting techniques, your cold brew might lack the smoothness of cafe-style cold brews. You need a rumble jar! A rumble jar is a unique and innovative device designed specifically for making cold-brew coffee.
Unlike traditional cold brew methods, which often involve steeping coffee grounds in water for an extended period, this jar offers a more efficient and user-friendly way to prepare cold brew. This tool aims to simplify the cold brew process, making it accessible for both beginners and experienced coffee enthusiasts.
The Rumble Jar is essentially a specially designed mason jar with a built-in stainless steel filter. It’s crafted to make the process of brewing cold coffee straightforward and mess-free. The jar itself is usually made of high-quality, durable glass, and the filter is designed to be fine enough to keep coffee grounds contained while allowing water to flow through. The Rumble Jar also often includes a lid that helps keep the brew fresh and can double as a handle for shaking the jar, which is a key part of the brewing process.
It has a stainless steel filter. The fine mesh filter prevents coffee grounds from escaping into the liquid, ensuring a clean, smooth brew. The jar is typically made of borosilicate glass, which is known for its durability and ability to withstand temperature changes. A secure lid is essential to prevent spills and maintain the freshness of the brew.
How does a rumble jar work?
A rumble jar is pretty simple to use. You start by adding coarsely ground coffee to the stainless steel filter. The grind size is crucial; too fine, and the grounds may slip through the filter, too coarse, and the extraction might not be optimal.
After placing the grounds in the filter, you pour cold or room temperature water over them. The amount of water used can vary depending on how concentrated you want your cold brew to be. Once the water is added, the jar is sealed with the lid, and then shaken gently. This step, often called "rumbling," helps ensure that all the coffee grounds are fully saturated with water, promoting even extraction.
The mixture is left to steep, typically in the refrigerator, for about 12 to 24 hours. The length of time can be adjusted based on personal taste preferences; longer steeping times generally result in a stronger brew. After steeping, the stainless steel filter, now containing the used coffee grounds, is removed. The cold brew can be served immediately or stored in the fridge for later use.
The Rumble Jar simplifies the cold brew process significantly. Its all-in-one design means there's no need for separate filters, pitchers, or other brewing apparatus. This makes it especially appealing for those who want a hassle-free brewing experience.
The design of the Rumble Jar, particularly the fine mesh filter, ensures a consistent extraction by keeping the coffee grounds well-contained and evenly saturated. This consistency can be more challenging to achieve with traditional methods, where coffee grounds may settle unevenly.
The compact design of the Rumble Jar makes it easy to store in the refrigerator or transport if needed. The jar can often be used to both brew and serve the coffee, reducing the need for multiple containers. Cleaning the Rumble Jar is straightforward. The stainless steel filter can be easily rinsed or washed, and the glass jar is typically dishwasher safe.
