Thaw the frozen salmon and spinach and fry briefly in a saucepan. Add the cream, a little olive oil, the herbs with the garlic (chopped) and the shrimp. Bring to the boil and set to the desired consistency with a sauce thickener. Season to taste with salt and pepper. Add a little mozzarella to the mixture.
Layer alternately with lasagne sheets in a greased casserole dish. The top layer must not consist of lasagne sheets!
Sprinkle with cheese and put in the oven at 180 ° C for about 15 minutes, until the cheese has a nice golden brown color.