Grate the courgette onto a sieve Add a pinch of salt and rest for 10 minutes.
Meanwhile, preheat the oven to 180°C.
Take the stalks from the mushrooms and chop them finely.
Squeeze the liquid out of the courgette and add the flesh to the mushrooms.
Add the garlic, lemon zest, and a pinch of nutmeg or paprika.
Combine the mixture with the grated cheese.
Place the mushrooms on a lightly greased baking tray.
Spoon the stuffing into the mushrooms.
Bake in the oven for 10-15 minutes, until golden.
Scatter the pine nuts on top (if used) and serve.