Try putting the honey in a pot and then heat it on the lowest setting using your stove. Be sure to stir it. This reconstitutes the honey, making it liquid once more.
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It is still honey! :-) This is only a physical reaction - the sugars crystallising. Be careful not to overheat though as that risks a chemical reaction spoiling the flavour. Best way to warm it is to use a pan of water as a simple bain-marie, so the most it can over-heat to is the boiling-point of water - but don't let it reach that.
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Time is what crystallizes honey. You can reconstitute crystallized honey but you can also buy a smaller quantity that you will use before it can crystallize. You can also use it in its crystallized form. It's very good. It is especially good in hot beverages.
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Or just buy "Tupelo Honey", known worldwide for its inability to crystalize.
Very gently warm it enough to melt, while stirring it. Be careful not to over-heat so damage it.