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Heat 3 tablespoons of extra virgin olive oil in a pan, add the chopped onion, and sauté until soft and translucent. Add the mince and bay leaf, then stir with a wooden spoon to break up any lumps. Brown the meat well. Pour in the white wine (or water if not using wine) and increase the heat to help it evaporate. Cook for 10 minutes over medium heat, then set aside to cool.
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Prepare the tomato sauce by heating 2 tablespoons of extra virgin olive oil in a pot, adding the chopped onion, and sautéing until soft and translucent. Add the tomato purée, salt, pepper, and basil leaves. Cover and cook over low heat for 20 minutes, then set aside to cool.
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To make the filling, mix the cooked mince with the ¾ cup – 200 ml béchamel sauce and the 1½ cups – 85 g – 3 oz Parmigiano Reggiano, finely grated. Adjust the salt and pepper.
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Bring a large pot of salted water to a boil. Cook the pasta sheets for 1 minute, working in batches. A shallow but wide pot helps keep the sheets in a single layer so they do not stick together. Lift the sheets out with a slotted spoon and place them on a clean tea towel to cool.
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Spread ⅛ of the filling along the long side of each cooked pasta sheet, then roll it up to form a cannellone. Repeat with the remaining sheets.
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Lightly grease a large oven dish with cooking oil (or melted butter). Spread a thin layer of tomato sauce across the bottom, making sure to reach the corners. Arrange the cannelloni in a single layer.
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Cover the cannelloni with the remaining tomato sauce and the 1¼ cups – 300 ml béchamel sauce. Sprinkle with the remaining ½ cup – 35 g – 1 oz Parmigiano Reggiano.
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Bake in a preheated moderate oven at 350°F – 180°C – gas mark 4 for 20 minutes, then broil (grill) at 400°F – 200°C for a further 5 minutes.
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Serve immediately.