1.Boil, steam or microwave potato until tender; drain. Mash potato in a large bowl with the egg yolks, butter, flour and cheese. Stir in tuna and green onions. Cover, refrigerate for 30 minutes.
2.Using floured hands, shape heaped tablespoons of the potato mixture into croquettes, dust with extra flour; shake away excess. Dip croquettes, one at a time, in combined eggs and milk, then in breadcrumbs. Refrigerate for 30 minutes.
3.Heat the oil in a large saucepan; deep-fry the croquettes, in batches, until browned lightly. Drain the croquettes on absorbent paper. Serve with lemon wedges.
4.Not suitable to freeze. Potato suitable to microwave.
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