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1
For the tomato sauce heat the oil in a large frying pan. When it's hot, add the chopped vegetables and the garlic. Sautee until lightly browned (about 5 minutes).
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2
Then add the passata or pasta sauce and seasonings if using. Simmer for 10 minutes, then set aside.
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3
For the white sauce heat the oil in a pot. When it's hot, add the flour stirring vigorously using a wire whisk for about 2 minutes or until flour is nicely browned.
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4
Add a small portion of the warm milk and stir to combine. Add the remaining milk little by little stirring after each addition.
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5
Season, reduce the heat to medium-low and simmer for about 10 minutes or until thickened. Set aside.
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6
For the cream cheese spinach layer combine all ingredients in a large bowl.
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7
When your're ready to assemble the lasagna spread a bit of the tomato sauce in a large casserole dish (mine holds about 5 l/5 quarts). Top with two lasagna sheets and then half of the remaining tomato sauce. Top with another 2 sheets of lasagna and then the remaining half of the tomato sauce.
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8
Then add another 2 sheets of lasagna and on top of that the spinach cream cheese spread.
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9
Cover with another 2 lasagna sheets, pour over white sauce and top with grated cheese (if using).
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10
Place in the preheated oven and bake at 180u00b0C/350u00b0F for about 30 minutes or until bubbly and nicely browned (you might need to cover it after 20 minutes if it gets too brown).
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11
Remove from the oven and allow to set up for 20 minutes before cutting.
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12
Enjoy!