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$9,707 pledged of $24,000 goal
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By Daniel Murphy
$9,707 pledged of $24,000 goal
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About

Meet the Cave Kettle

The world's first purpose built Bone Broth brewing machine. Make real bone broth with about 1 minute of prep time - no stirring, attention, or soaking needed. 

The Cave Kettle
The Cave Kettle

Bone broth has been around for a long time, but the health benefits it can bring have only been discovered recently. Naturally, large companies have been getting into the space and filling shelves with offerings to fill this need. Pre-packaged broths are legion and loaded with preservatives (they have to be!). They are primarily water mixed with bouillon concentrate, lacking proteins, minerals, and nutrients that you come from true bone broth. 

Substitutes
Substitutes

Broth is typically made by slowly brewing bones in hot water for a long period of time - this is not a sophisticated process. It has traditionally been made as the base for communal soups, requiring a large audience and a long time to brew. The Cave Kettle is designed to replicate this process, but for much smaller groups. The guts of the Cave Kettle are stainless steel with a propeller shaft that gently stirs and then periodically rearranges the bones you add. 

That's a key point: "bones you add". That means you can use grass fed beef bones and whatever ingredients you source. You can keep it local with nose to tail eating. Pre-cut bones of many types are easily found at your local butcher or grocery store. 

How to Use

4 Steps.
4 Steps.

How It Works

Bone Broth Brewing
Bone Broth Brewing

When you push the standard cycle button, the Cave Kettle doesn't start heating immediately - there is a lag period to allow the vinegar to soak into the bone pores. Once the soak is complete, the broth temperature ramps up with stirring cycles occurring at periodic intervals. This is a combination of slow motion and higher speed pulses to reorient bones that adjust based on the temperature and cycle. This keeps the broth in motion, fully utilizing the bones and making for a richer bone broth. 

Bone Marrow
Bone Marrow

Bone marrow is full of nutrients, but these can be hard to extract with a traditional slow cooker. The lack of liquid motion overuses exposed areas and leaves many nutrients remaining in the bones.  

Paddle Stirrer
Paddle Stirrer

The Cave Kettle uses a brushless DC stepper motor attached to the paddle stirrer that continually churns the bones throughout the process. This allows complex pulses to handle different brewing profiles. The paddle stirrer is designed for any type of bones - chicken, pork, beef, fish, etc. It has a hinge that allows it to move out of the way if there is a bone impeding its path and the motor is preprogrammed to adjust the flow so bones don't get stuck! 

Temperature Sensor
Temperature Sensor

The Cave Kettle has a combination temperature and boil-over sensor. This makes certain that your broth never overheats and never spills over. It can be left up to 24 hours unattended - making for some seriously rich and deliciously buttery broth. 

Detachable Strainer
Detachable Strainer

One of the larger convenience issues I ran into with slow cookers was pouring. It always required either a ladle or two hands, which is always awkward and always messy. The Cave Kettle has an attachable strainer that allows you to easily pour even chunky soups from a spout with one hand and without splashing.  

Why Bone Broth?

Other than being absolutely delicious, true bone broth is amazingly healthy. There are plenty of articles that explain it better than we can, but suffice to say that figures such as Kobe BryantTim Ferriss, and Dave Asprey are big proponents. 

Health Benefits:

Bone Broth Nutrition
Bone Broth Nutrition

 

Key Nutrients:

Bone broth is loaded with a myriad of minerals and 19 different amino acids. The specific vitamin profile depends largely on the type of bone you use for your Bone Broth. Here are a few you will find from a basic recipe:

Bone Broth Macros
Bone Broth Macros

 

How to Use Bone Broth

Sports Drink: Contains high quality proteins and electrolytes (minerals) to help you rehydrate and replenish lost minerals during exercise.

Muscle Builder: With 19 different amino acids it aids in muscle protein synthesis. Imagine this as a replacement for your awful tasting BCAA drink. Important for the growth, maintenance and repair of your muscle groups. 

Health Drink: Overall health benefits for wellbeing and vitality.

Soup Base: Most soups have a base of bone broth, so you can get these started in the Cave Kettle and use when convenient. Phở, hot pot, borscht, and many others are traditionally made with a rich bone broth.

What You Get

What's Included
What's Included

The production model is pictured below, see FAQ for details. 

The Cave Kettle
The Cave Kettle

 

The Machine Itself
The Machine Itself

 

Cleanup

Uncomplicated Cleanup
Uncomplicated Cleanup

After using a series of awkward and difficult to clean pots to make bone broth at home, I knew the Cave Kettle had to be lighter weight and simple to access. Just lift the top to access everything that actually needs to be cleaned. The all stainless steel broth strainer attaches to separate solids from liquids and detaches for use in the dishwasher. Everything inside has a smooth stainless steel surface and is easily accessible. It’s ready to be used over and over again.

FAQ

+Takes a minimum of an hour, but overnight is recommended for maximum protein and nutrient extraction.

+Tastes best warm but is commonly drunk at room temperature and below.

+Broth from the Cave Kettle will keep 3-4 days in a refrigerator.

+Works with all types of bones (lamb, chicken, pork, beef and fish) and can be used to make basic vegetable broth

+Can be left unattended for up to 24 hours

+Available in 110V and 220V with US / AU / EU / UK plugs

+Comes with a one-year parts and labor warranty. We'll even provide a return label. We’re here to help.

+The final color will be matte black.

Timeline

Charles has a background in industrial engineering and worked with me to sketch and develop a complete design for the Cave Kettle. We have already visited and worked with an appliance factory in south China to develop the molds and tooling to the point that a prototype could be made, which is how we got the Cave Kettle pictured in the video. The design is finished and we have coordinated our Kickstarter timeline to correspond neatly with extra capacity the factory has available in the beginning of November. Production will finish by the first week of November, with shipments to you going out mid December.  

Timeline
Timeline

The Team & Our Background

Like most inventions, the Cave Kettle began as a problem - finding a sports drink that is actually healthy. After years of using sugary "electrolyte" filled drinks, I began learning more about the Paleo movement and thinking about how this fit in that context. It dawned upon me that nothing on the shelf even vaguely resembled the diets of our ancestors, even the ones that looked good at the macro level. 

So I started to make bone broth in my slow cooker, which was always an ordeal. Aside from taking up my entire counter, it always made way too much and took too long and perpetually occupied my dishwasher. Then I began to make bone broth in pots, which overheat and dry out, causing a separate set of issues. I happened to mention the problem to my friend Charles, who was surprised that no one had come up with a solution to the issue. That's when we started work on a purpose built broth machine.

Dan 

Lieutenant Dan
Lieutenant Dan

I've always been into staying fit, eating healthy, and having a more sustainable community. After serving as an enlisted Marine for six years and then as an officer in the U.S. Army for another five, I attended the full-time MBA program at Georgia Tech. After graduating Georgia Tech, I launched Relay, Atlanta's bike share program. It was an amazing opportunity for me to launch a product that touched on issues like equitable access to transportation, healthy exercise, a "greener" way to travel, and connecting the people within the city of Atlanta. While going to grad school school full-time, I learned about the paleo diet and found that making foods from scratch at home was both healthier and more affordable than the prepackaged alternatives. Around this time, I started to enjoy bone broth and use it as a sports drink. Over this time, I explored new ways of making it which always seemed limited by the equipment, which is where Charles comes in. After working through the machine design with Charles for the past months, I'm excited to be launching Cave Kettle. 

 Charles

Just like Dan, I've always been into living a fit lifestyle and eating healthy. I was intrigued when he told me about the problems he had making true bone broth. I hadn't tried using bone broth, and typically had just used whey powder for my workouts. I graduated from Georgia Tech with an Industrial Engineering degree with a background in procurement. In the past I worked for a large supply chain solutions provider and have seen first hand how the logistics of sourcing such products are accomplished. In addition to fluently speaking Mandarin, my engineering background helped me to communicate prototype and tooling specifications to our manufacturer. 

Risks and challenges

Delivery: We have worked hard to pin down a specific production date at a specific factory that has both the capacity and the expertise to make the Cave Kettle. Tooling delays have been eliminated because we already have the tooling in place. At this point, we just need to pull the trigger. Charles speaks Mandarin and has successfully negotiated shipments from China in the past. We will ship all non-US preorders directly from China to maximize timing. So, although unexpected delays can happen in customs, we fully anticipate orders will be shipped and delivered before Christmas.

Use: Before posting this project we have tested our prototype device with multiple different bone broths (lamb, chicken, beef, pork and fish) to ensure maximum compatibility. We have not tested all animal bone varieties, but are happy to do so if there are specific requests.

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    Early Bird Cave Kettle

    One Cave Kettle Machine - Expected MSRP $218

    220V option available

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    One Cave Kettle

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    220V option available

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    Two Cave Kettles

    Two Cave Kettle Machines

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Funding period

- (30 days)