How to prevent peeled fruit or vegetables turning brown: Stage 1

To improve this technique, it is necessary to ask a chemist, and who better than Herve THIS on the subject. He explains that it's the Vitamin C in the lemon juice which prevents the fruit from browning, and not its acidity. So to prevent fruit from browning at all it suffices to add a pinch of Vitamine C.

See the difference in the photo: Two glasses containing mashed pears and lemon juice, mixed for a sorbet 5 minutes ago.

Right-hand glass contains a pinch of vitamin C...