How to store half a lemon – and 17 other ways to keep leftover food fresh

What should you do with opened tins, cut avocados and egg yolks that weren’t required in your recipe? Chefs and food experts tell allAttention home cooks: do you, like me, have half a lemon, perhaps encased in a beeswax wrap or clingfilm, sitting in your fridge? Half a cucumber, going… 

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