How do you prevent from kumara turning brown?

To prevent kumara (sweet potato) from turning brown after cutting, you can soak the pieces in water with a little lemon juice or vinegar, which helps inhibit oxidation. Alternatively, you can briefly blanch the cut kumara in boiling water, then cool them in ice water before storing. Keeping them in an airtight container in the refrigerator can also help maintain their color. Always use fresh kumara, as older ones are more prone to browning.