Roasted Pista / Pistachios

Roasting pistachio is defined as cooking using dry heat, which cooks the food evenly on all sides. Most nuts are roasted without their shell, except for pistachios, which are often roasted in-shell. Roasting methods are sometimes used to separate the shells of nuts from their kernels. This is a common method of shelling cashews and the reason why they’re almost never sold raw. During roasting, nuts lose some moisture. Therefore, a roasted nut weighs less than a raw nut. That explains why the fat content per ounce is slightly higher in roasted nuts Source: healthline.com