Accounts filed at Companies House show Wasabi Sushi Bento made a pre-tax profit of £4.26m in the year to 27 December compared with a loss of £1.15m when it booked heavy expansion costs.
Turnover grew by 22 per cent to £70.4m compared with £57.9m the previous year.
Wasabi was founded in 2004 by Korean entrepreneur Dong Hyun Kim, who previously ran a takeaway food stall in Camden Market.
At the end of the year, the company had 43 outlets, including 40 Wasabi branches, Korean restaurant Kimchee on High Holborn and two smaller takeaway formats called Kimchee to go.
Kim has ambitious plans to grow the chain both in the UK and in the US, and said that Wasabi was confident that it will be able fund its expansion using a mixture of cash and available loan facilities.