Mouldy Tomato Paste

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Don't you just hate it when you open the jar of tomato paste you have been storing in the refrigerator only to find it has a thick crust of mould on top? Unfortunately it's a feature of good quality paste, which doesn't have preservatives in it.

One way to prevent this is to pour some olive oil in the jar so that it completely covers the paste.

An even better (and simpler) way is to store the jar, in the fridge, upside down.