-
Roll the lasagna as thinly as possible. With a
knife, cut into sheets of 8 x 11cm/3 1/2 x 4 1/2in and
let them rest on dry tea towels for at least 15
minutes.
-
Bring a large saucepan of water to the
boil. Add the salt and slip in the pasta, 2 or 3
pieces at a time, leaving to cook for 1 minute.
Remove with a slotted spoon and immerse immediately
in cold water. Lay the pasta on damp tea towels.
-
Place the spinach in a large, deep pan with no
water. Cook, tossing occasionally, for 5 to 10
minutes. Remove from heat, chop finely and set
aside.
-
Warm the butter in a frying pan and add the
onion. Sauté over a medium heat for 4 minutes. Add
the prawns and sauté quickly, stirring to cook
evenly. Remove the pan from the heat and stir in the
chopped spinach and salt.
-
Preheat the oven to
200°C/400°F/Gas mark 6.
-
Combine the tomato and béchamel sauces. Select a 25 x 35cm/10 x 14in baking
dish. Smear a very thin layer of sauce on the bottom
of the baking dish. Carefully place a layer of the
pasta over the sauce, to cover the entire area.
-
Smear a thin layer of sauce over the pasta. Spoon
some of the spinach and prawn mixture over it, and
sprinkle with some Parmesan. Repeat the process of
layering, ending with a layer of pasta, topped with
sauce and cheese.
-
Bake for about
20 minutes, or until the sauce forms a light golden
crust. Remove the dish from the oven and leave to
stand for 10 minutes before serving.