Rapper Cardi B says boiled onion water has added a 'shine' to her hair

Cardi B highlighted that the boiled onion water does not retain the pungency of the raw vegetable. Photos: Cardi B/Instagram

American rapper Cardi B has unveiled an unexpected secret weapon to her sleek black tresses: boiled onions.

The Bodak Yellow songstress took to Instagram on Friday (Aug 12) to share the hack with her 140 million followers.