A method of forming a cup-shaped body for a beverage capsule comprising the steps of: a) in a first stage drawing a sheet of material into a cup-shaped body preform; and b) in a second stage transforming the cup-shaped body preform into the cup-shaped body; wherein after the first stage the cup-shaped body preform comprises a base and a preformed side wall which extends from the base to a rim; wherein the preformed side wall comprises: - an outwardly-extending step proximate the rim; - a primary side wall section extending between the base and the outwardly-extending step; and - a secondary side wall section extending between the outwardly-extending step and the rim; wherein in the second stage the preformed side wall is deformed such that the cup-shaped body comprises the base and a side wall which extends from the base to the rim; wherein the side wall comprises: - an annular trough; - a first side wall section extending between the base and the annular trough; and - a second side wall section extending between the annular trough and the rim; wherein the second side wall section defines a ridge zone located radially outwards of the annular trough and the ridge zone is formed during the second stage by deformation of the outwardly-extending step and/or the secondary side wall section; and wherein the sheet of material comprises an aluminium material. a) in a first stage drawing a sheet of material into a cup-shaped body preform; and b) in a second stage transforming the cup-shaped body preform into the cup-shaped body; wherein after the first stage the cup-shaped body preform comprises a base and a preformed side wall which extends from the base to a rim; wherein the preformed side wall comprises: - an outwardly-extending step proximate the rim; - a primary side wall section extending between the base and the outwardly-extending step; and - a secondary side wall section extending between the outwardly-extending step and the rim; wherein in the second stage the preformed side wall is deformed such that the cup-shaped body comprises the base and a side wall which extends from the base to the rim; wherein the side wall comprises: - an annular trough; - a first side wall section extending between the base and the annular trough; and - a second side wall section extending between the annular trough and the rim; wherein the second side wall section defines a ridge zone located radially outwards of the annular trough and the ridge zone is formed during the second stage by deformation of the outwardly-extending step and/or the secondary side wall section; and wherein the sheet of material comprises an aluminium material. wherein after the first stage the cup-shaped body preform comprises a base and a preformed side wall which extends from the base to a rim; wherein the preformed side wall comprises: - an outwardly-extending step proximate the rim; - a primary side wall section extending between the base and the outwardly-extending step; and - a secondary side wall section extending between the outwardly-extending step and the rim; - an outwardly-extending step proximate the rim; - a primary side wall section extending between the base and the outwardly-extending step; and - a secondary side wall section extending between the outwardly-extending step and the rim; wherein in the second stage the preformed side wall is deformed such that the cup-shaped body comprises the base and a side wall which extends from the base to the rim; wherein the side wall comprises: - an annular trough; - a first side wall section extending between the base and the annular trough; and - a second side wall section extending between the annular trough and the rim; - an annular trough; - a first side wall section extending between the base and the annular trough; and - a second side wall section extending between the annular trough and the rim; wherein the second side wall section defines a ridge zone located radially outwards of the annular trough and the ridge zone is formed during the second stage by deformation of the outwardly-extending step and/or the secondary side wall section; and wherein the sheet of material comprises an aluminium material.