According to Osho, when a taste suddenly appears during meditation, it is one of many sensory residues released as the senses relax. Don’t chase or interpret it; simply watch it arise and pass. Such phenomena are not lofty attainments but indicators that meditation is deepening. Stay a witness and continue going inward without distraction or attachment.
If you taste something during meditation, it’s just old sense impressions surfacing—notice it and keep meditating.