A method of forming a frozen beverage vessel, the vessel having a shell of desired thickness and transparency surrounding an interior volume, the method including: (i) providing a mould having an interior surface, the interior surface having a shape corresponding to a desired external surface shape of the shell; (ii) at least partially filling the mould with a liquid; (iii) refrigerating the at least partially filled mould; (iv) rotating the at least partially filled mould, whilst under refrigeration, about an axis of rotation such that unfrozen liquid flows over the interior surface of the mould; (v) varying the axis of rotation; and (vi) repeating steps (iv) and (v) under conditions and for a time sufficient to form the shell of desired thickness and transparency.