Comments Heinz Ireland is celebrating St. Patrick’s Day 2021 with the launch of its very first, limited-edition [Seriously] Good Shamrock Mayo. Only 75 jars are up for grabs across the Republic of Ireland of the new creation that Heinz Ireland says combines its rich and creamy Heinz [Seriously] Good Mayonnaise with shamrock grown in the beautiful fields of Co. Kerry. Read more Heinz Ireland says: "A deliciously light twist on a classic, our chefs have blended Heinz [Seriously] Good Mayonnaise - made with quality ingredients and free-range eggs - with shamrock grown in the fields of Co. Kerry, to make a luscious green-hued and tasty mayo.