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Pesto - stop the mould - stop the mouldPesto - stop the mould <div class="ExternalClassE8B48B654BED4BE3B4F013E91090BC0A"><p>‚Äč<span lang="EN">For any leftover in a jar, scrape the sides of the jar and smooth the surface. Cover with enough oil so that none of the paste is exposed, then refrigerate. The oil stops the air getting to it and turning mouldy. Same can be done for tomato puree</span></p></div>Janet KorsalUnited Kingdom