Lumpy gravy is relatively easy to fix. Put it into a blender and whizz it until the lumps have disappeared. Return it to the heat, then bring it to the boil to thicken, if necessary. If it's still too thin, mix a teaspoon of cornflour with cold water, then add it to the gravy and simmer until thickened. This technique is known as 'slaking'.

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Last updated by Luke Paton.

36 simple ways to fix common cooking mistakes