WebJun 2, 2022 · Bring to a boil. Once a boiling point has been reached, immediately remove the saucepan from the heat and set aside. Layering the gratin: Use a 23cm x 15cm x 6cm (9 x 6 x 2.5in) ovenproof dish. Spoon a …
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WebNov 3, 2018 · Melt the butter in a large pan with the vegetable oil, then add the celeriac and a large pinch of salt. Cut a round piece of baking paper the same size as the pan and use to cover the celeriac. Cook gently for 20 …