[citation needed] Tallberg started his career in the restaurant business at The Ivy, London where he worked as a chef from 1997 to 1999 learning from Mark Hix.

[3] In 2005 he started as an executive chef for the Lloyds TSB Commercial Finance/Compass Group being in charge of the directors’ dining and events at the headquarter.

At the same time he also worked at Tertin Kartano[6] mansion during the summer seasons of 2010 to 2012, developing their menu and recipes as well as training the staff in tending the restaurant's garden and foraging.

Tallberg was also a head chef for NOMAD - a street food concept launched at FLOW festival[7] in Helsinki in August 2013.

Since early 2022 he has been running his concept restaurant ST X FDS in collaboration with Finnish Design Shop in Turku, Finland.

[12] His foraging expertise covers areas from the cities of the UK and Finland to the countries within Boreal forest zone (Taiga).