Chill the Icelandic gabbro rocks in a freezer for at least two hours.
Place 2-3 rocks in a glass and pour the drink.
The drink is chilled without being diluted.
2 - 3 rocks are sufficient to cool a double measure.
Wash the rocks and let them dry before placing them in the freezer again.
Note: Excessive alcohol consumption may impair you're judgement.
Be careful not to swallow the rocks.
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