Gather the ingredients: Flour, chilled butter, egg yolks, water, butter, onions, apple, lime rind, quick cooking oats, dried basil, fresh herbs, gherkins, sausage meat, egg, and milk for glazing.
In a mixing bowl, combine the flour and diced chilled butter. Rub the mixture until it resembles breadcrumbs. Add the egg yolks and chilled water. Knead lightly until a soft dough forms. Allow the dough to chill in the refrigerator.
In a saucepan, melt the butter over medium heat. Add the diced onions and cook until softened. Then, add the peeled, cored, and diced apple along with the grated lime rind. Cook for an additional 5 minutes.
Remove the saucepan from heat and let the mixture cool. Once cooled, add the quick cooking oats, dried basil, fresh herbs, chopped gherkins, and sausage meat. Mix well to combine all the ingredients.
Preheat the oven to 190°C (375°F). Roll out the chilled pastry dough into a rectangle on a floured surface. Brush the surface of the pastry with beaten egg.
Using a sharp knife, slice the edges of the pastry diagonally at intervals. Place the prepared apple and sausage mixture in the center of the pastry. Fold the sliced edges of the pastry over the filling to seal it.
Brush the assembled Apple Sausage Plait with a mixture of beaten egg and milk for a golden glaze. Bake in the preheated oven for about 30 minutes or until the pastry is golden brown. Allow to cool slightly before serving.
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