The drupe/stone fruits are usually characterised by having thin layer of outer skin covering the soft fleshy fruits. Inside the fruits are single hard stone or pit, which contains a single seed, where they are centralised. The stones are sometimes referred to as the seeds. The family of drupes/stone fruits usually arrive in summer at reasonable price but can be quite expensive during the off-season. The farmers usually harvest them while they are slightly unripe so that they won’t get damage during the transportation journeys. This is why you usually notice that the drupe/stone fruits at the market are not sweet during the very early summer. The simple solution is to let them soften at room temperature for a couple of days. Once you can feel the softness of the fruit, it is sweet and ready to eat.
Drupes/Stone (Fleshy)

Peach