Spenat- och ricottalasagne

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1. 1
   First make the white sauce. Melt the butter and flour together in a big saucepan, and cook the paste for a couple of mins. Add the bay leaves, then gradually whisk in the milk, little by little, until you have a nice smooth sauce. Bubble for a few mins, then season with salt, pepper and nutmeg. Remove the bay leaf, cover with cling film (lay it directly onto the sauce) until ready to use.
2. 2
   Gently cook the onions in the oil until really soft. Put the kettle on. Put half the spinach in a big colander and pour over the boiling water to wilt. Repeat with the rest of the spinach, let it cool a little then squeeze as much liquid as you can out of the spinach. Roughly chop and stir into the onions with the ricotta, a small ladle of the white sauce and most of the parmesan. Season well.
3. 3
   Heat oven to 200C/180C fan/gas 6. Spread a quarter of the sauce into the base of a big baking dish, then dollop over a third of the spinach mixture. Top with a layer of lasagne sheets, then repeat the layers – a quarter of the sauce, third of the spinach mix and some lasagne sheets. Finish with the remaining sauce and scatter over the remaining parmesan. Bake for 40-50 mins until the lasagne is cooked through and the top golden, scattering over the pine nuts with 10 mins to go.