Hot cold brew coffee
It might sound a little contradictory, but we can assure you that "hot cold brew" is a real thing, it's amazing and almost no stores even serve it for whatever reason. It's simply standard cold brew coffee that has been heated to make it into hot coffee.
So, what's the point? Remember that the secret to cold brew's sweeter, less acidic flavor is the use of cold water during the steeping process. So when you take cold brew, remove the grounds and then heat up the coffee, you get a similar sweet flavor to cold brew, only now it's hot coffee. Yep, cold brew coffee does not actually need to be drank cold!
So go ahead and brew a batch of cold brew, and follow the heating instructions below to give hot cold brew a try. The only real things to remember are 1) make sure the grounds have been removed before heating, and 2) don't let it boil.
Step 1: brew a normal batch of cold brew in your Rumble Jar
Step 2: once the steeping has finished (8-24 hours depending on your method), remove the filter full of grounds
Step 3: empty the brew into a small stovetop pot that comfortably fits a quart of liquid
Step 4: set stove to low heat and begin warming the pot
Step 5: keep an eye on the pot to make sure it does not boil
Step 6: once at desired temperature, pour into a heat-safe coffee mug (don't pour back into the Mason jar, since it is not tempered and could break)
Alternatively, you can use a microwave for the heating process. Our recommendation is to pour the brew into a different, microwave-safe container before heating. Mason jars are not tempered (and can also get super hot to the touch!), so they don't work very well with hot liquids and may break unless you have a lot of experience working with them.
This is an easy one. Cold brew (obviously) makes for excellent iced coffee. With your Rumble Jar, the only adjustment you'll need to make is to use more grounds than usual. Consider filling the filter to the higher Concentrate Notch. The reason is that once you pour it over ice, the ice starts to melt and dilute your brew. So the extra grounds will counteract any watery taste.