Known as an Italian recipe, with similar versions prepared across other nations.
Cook safely
Keep children and pets away from the hob and the oven, and keep oven gloves and a lid within reach.
Oven and hot trays. Use dry oven gloves for trays and dishes: a hot tray looks just like a cold one. Open the oven door away from your face and let the first rush of heat out.
Method
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This gives great scope for contrasting cheeses in one and the same dish.
In a shallow baking pan put a foundation layer of grated Cheddar and a little butter.
Cover with a layer of tender parts of asparagus, lightly salted;
next a layer of grated Gruyère with a bit of butter, and another of asparagus.
From here you can go as far as you like with varied layers of melting cheeses alternating with asparagus, until you come to the top, where you add two more kinds of cheese, a mixture of powdered Parmesan with Sapsago to give the new-mown hay scent.