A muted colour scheme of burgundy and white and a lack of background music give the restaurant a calm atmosphere without the austerity of some French eateries.
My companion and I both chose the Summer Tasting Menu, which was a marathon of indulgence that took a considerable amount of time.
Of the seven courses, the highlights included the summer truffle risotto, which was rich and flavoursome, melt-in-the-mouth Welsh lamb à la menthe and the intriguing spicy soufflé of organic duck egg with a gingerbread finger, served in an eggshell and reminiscent of a boiled egg and toast soldiers.
Any cheese connoisseur would be suitably impressed with the 15 varieties available on the cheese board and to accompany this feast there is a wide range of wines available.
The staff are friendly, aware, knowledgeable and efficient – no napkin is left unfolded or glass unfilled.
This is definitely a place to impress your clients.
However, if you want to talk business, you might want to request one of the tables near the bay window, as the others are quite close together and provide little privacy.
Roussillon is also conveniently located; the nearest tube is Sloane Square, a 10-minute walk away, or you could jump in a cab from Victoria.
Roussillon is open for lunch on Wednesday to Friday, from noon to 2.30pm, and for dinner on Monday to Saturday from 6pm to 11pm.
Review by Amanda Lennon
16 Barnabas Street, SW1W 8PE 020 7730 5550 Dinner for two, with wine, £130.