Cut the 3 small zucchini into 0.5 cm thick slices.
Bring plenty of salted water to a boil for the pasta.
For the pesto, toast 100 g shelled hazelnuts in a dry pan.
Let the nuts cool briefly and chop coarsely.
Cook 500 g conchiglioni pasta according to the package instructions.
Grate 100 g Parmesan and add about half of it to the nuts.
Add 1 clove garlic and the leaves of 1 pot basil to the nuts and Parmesan.
Purée everything together with 8 tbsp oil. Add 2 tbsp of the pasta water and mix. Season with salt and pepper.
Fry the zucchini slices in a pan with 1 tbsp oil until golden brown.
Season with salt and pepper and drizzle lightly with 3 tbsp lemon juice.
Drain the conchiglioni, return them to the pot and toss with the pesto.
Serve the pesto pasta with the lemon zucchini and sprinkle with Parmesan.