Swiss cocoa and chocolate maker Barry Callebaut has signed a deal to supply Unilever's ice cream business.

Barry Callebaut said it will become Unilever's "strategic global supplier and innovation partner" for cocoa and chocolate.

The agreement will double the volumes Barry Callebaut supplies to Unilever, which will buy 70% of its cocoa and chocolate products from the Swiss firm.

Barry Callebaut CEO Juergen Steinemann said the company was "honoured" to have secured the deal. "This agreement is based on a successful long-standing collaboration between our two companies," he said today (23 January).

Kevin Havelock, president of Unilever's "refreshment" business, said the company's "leadership position" in the ice cream sector was based on "great taste, innovation and increasingly sustainable ingredients". He added: "We need partners like Barry Callebaut to help us extend this position and achieve our overall aim."

Last week, Barry Callebaut announced a new deal to supply baker Grupo Bimbo with chocolate to use in its products in Mexico. The agreement was announced on the day that Barry Callebaut said volumes in the first quarter of its financial year had fallen below target.