Start by dicing the 1.5 zucchini. Cut the rest into very thin sticks.
Pour the olive oil into a non-stick pan. Once heated, throw in the diced courgettes and the onion. Cook for 10 minutes. Add the garlic and cook for another 1-2 minutes. Set aside.
In the meantime, boil your pasta in salted water according to the instructions on the package. Two minutes before your pasta is done, throw in the zucchini sticks.
Once you have drained the pasta together with the zucchini sticks, keep some of the water.
Put the zucchini, onion and garlic in the blender. Add the cashews after soaking them for 20 minutes in hot water. Pour in the grated cheese and lemon juice.
Add salt and black pepper and the pasta water. Throw in half to begin with and you'll see.
Mix your pasta with the sauce and enjoy.