Pre-chill the mug by leaving it in the freezer until you need to use it. Pour in a hot fresh-brewed pot, and the lining outside the stainless steel interior efficiently transfers the cold it stored up in the freezer to the hot beverage. If you’ve ever poured hot coffee over ice to try and achieve a similar effect, you can understand the value of avoiding dilution in the process. Photo 1 of 3 in This Mug Makes Iced Coffee in Under 5 Minutes by Alexander George

This Mug Makes Iced Coffee in Under 5 Minutes

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Pre-chill the mug by leaving it in the freezer until you need to use it. Pour in a hot fresh-brewed pot, and the lining outside the stainless steel interior efficiently transfers the cold it stored up in the freezer to the hot beverage. If you’ve ever poured hot coffee over ice to try and achieve a similar effect, you can understand the value of avoiding dilution in the process.