Defrost your mug.
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While a cold beer can refresh, no brew should be served at freezer temperature. So forgo the frozen mug. Frosty temperatures mute a beer's aroma and flavor while amplifying carbonation (which is precisely why the makers of watery domestics suggest that you sip their beer ice cold). For a more nuanced beer, you'll want it to be closer to 38 degrees, which is the temperature that most bars use. Always insist on room-temperature glassware.