A Gisborne butchery has pulled out all the stops for St Patrick's Day and turned their sausages green.

This week's batch of gluten-free, preservative-free Irish sausages have had green food colouring added to them for the second year in a row.

"We have two restaurants, The Rivers and the White House, buying them this year," co-owner Jaki Watson told Gisborne Herald.

The Rivers Restaurant and Bar was last year named New Zealand's Best Guinness Bar and the celebrations there will last all weekend.

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Watson said she and her husband were not Irish themselves but the store had a lot of Irish customers.

"We have heaps of them, so we just did it for them."