heat the olive oil in a large pan and bring a large pan of water to the boil

sweat off the onion until it is translucent

add the garlic

add the shitake mushrooms and cook

add the button mushrooms and cook

add the oyster mushrooms and cook

add the pesto and the crème fraîche

season

add salt to your pasta water and cook the lasagna sheets for 3 minutes

you may need to loosen the pasta sauce with some of the pasta water

wilt the rocket leaves in a separate pan

add the beech mushrooms to the rest of the mushrooms

construct your open lasagna by putting rocket on the plate, then a lasagna sheet, topped with some mushroom sauce, then another lasagna sheet and the rest of the mushroom sauce