Denton Wilde Sapte (DWS) beat Slaughter and May to score its first mandate advising food and drink giant Cadbury Schweppes.
DWS was approached by the company to advise on its $450m (£228.33m) acquisition of Turkish gum business Intergum, owned by the Amram family.
DWS lead partner Philip Goodwin said: "This is the first time we've advised Cadbury Schweppes. They approached us because of our experience in Istanbul. We've had a presence in the jurisdiction for over 10 years."
The company does not have a formal panel, but the senior commercial lawyer at Cadbury Schweppes Angela van den Berg said it uses a select group of firms for different areas.
Slaughters has been instructed for corporate work in the past, Wragge & Co for litigation and food law expertise and Simmons & Simmons was also highlighted.
Van den Berg said: "The UK legal team is mainly based in the Bournville office and we deal with a variety of different aspects of the company. This particular acquisition was challenging and required a high level of local knowledge."
Cadbury Schweppes has experienced several key changes to its organisation in recent years, with the £1.27bn sale of its European drinks business to private equity groups Blackstone and Lion Capital in 2005.
Goodwin said: "Cadbury is an interesting company that has received a lot of interest in the market. We hope to work with them again in the future."
In March Cadbury Schweppes overhauled its global legal function, hiring new lawyers in various global locations and in several different practice groups.
White & Case advised the Amram family, led by senior partner Peter Finlay.