Abstract: The present disclosure discloses an appliance, suitable for home use, for grinding oil-containing hard produce, in particular oil-containing seeds, to therefore extract an oily substance product. For example, the appliance may grind sesame to obtain Tahini, or peanuts/almonds to obtain butter therefrom. The present disclosure further discloses a capsule to be received in a grinding appliance such as disclosed herein. The appliance incudes two grinding members, configured to grind the hard produce. Each grinding member has a grooved face that is patterned to be configured for grinding. The hard produce is grinded in the interface defined between the two grooved faces, defining a grinding zone. The grinding members typically have a shape of a circle and are aligned one with the other along a common axis. At least one of the grinding members is configured to rotate about the axis to perform the motion carrying out the grinding in the interface between the members.