I have a question about the recipe "Earl Grey and Five Spice Millionaire's Shortbread" from Anitalectric. how do i know when the caramel is ready?
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When the mixture reaches the temperature indicated in the recipe instructions. Use a candy thermometer, the classic one is less than six bucks at Amazon.
You can apparently also use digital infrared thermometers to take a no-mess reading; those start about $12-15 at Amazon.