Put a layer of slate or tile over the whole top. Just place them loose or perhaps use some silicone to affix them rather than going with mortar as the temperature changes and differences in the co-efficients of thermal expansion between materials would loosen up a mortar job.
I would go with a slate of stone product though because then any cuts / exposed edges would not have to be dressed up.
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"The trouble with people idiot-proofing things, is the resulting evolution of the idiot." Me
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