A system comprises a capsule (30) with a wall and a capsule extraction unit (10,10′, 20). The extraction unit has a capsule holder (20) for holding the capsule and an opener (10) with a cutting edge (151) for forming an opening (37,38) in the capsule wall (32,33) by cutting the wall. The opener (10,10′) further comprises a ram (152) that recesses a portion (39) of the capsule wall (32,33) adjacent to the opening (37,38) after formation of the opening by cutting the wall (32,33) by the cutting edge (151).