Usually museum or gallery cafés serve as places for refreshments or a light meal after a visit to the exhibitions.  They are in most cases a complement to the art experience and not destinations in themselves.
However, Saatchi Gallery in London is an exception. Its annex, Gallery Mess, now offers a café, restaurant, and bar open throughout the day while also being an exhibition space itself. It’s used for the works of artists featured on the gallery’s website which can be admired as visitors savor equally artfully-presented food.
The menu is the responsability of one of the country’s best event caterers and there is something different for breakfast, a light lunch, and dinner.  Only fresh seasonal ingredients are used in the daily specials, and you may have them inside or at the outdoor tables.

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