How do you stop peeled parsnips going brown?

To prevent peeled parsnips from turning brown, you can place them in a bowl of cold water with a splash of lemon juice or vinegar, which helps inhibit oxidation. Alternatively, you can blanch them briefly in boiling water and then transfer them to ice water to halt the cooking process. Store the parsnips in an airtight container in the refrigerator if not using them immediately.