An apprentice-run restaurant will reopen to diners in May.
The Castle Diary on Wildman Street was closed after being damaged by Storm Desmond in December 2015.
Head Chef Chris O’Callaghan said: “There’s a lot of excitement building both within the Castle Dairy and further afield that we’ll soon be back in business and we can’t wait to get cooking.
"It’s almost surreal that we’ve got an ultra modern kitchen, that’s quite unlike anywhere I’ve worked before, yet we’re going to be serving the food in a 14th century building.
"The two worlds are completely different, which just makes the Dairy an extra special place.”
The restaurant has undergone a complete refurbishment following a lengthy drying-out process.
A spokesman described the new carnation of the restaurant as having “the same authentic and historic charm it had before the flood.”
The Castle Dairy will reopen for dinner on May 13 and for lunch and dinner from May 17.
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