Place Parmesan, herbs and spelt into Thermomix bowl and mill for 20 seconds on speed 10.
Add fat, flour and a pinch of salt. Mix for 6 seconds on speed 6. Add enough cold water to form a crumbly dough. Mix for 10 seconds on speed 6. Push dough together, form into a disc and wrap in Silpat mat. Refrigerate for 30 minutes. Roll out on floured Silpat mat and line a 23cm deep dish flan tin with removable base. If you prefer, use a pie dish with similar proportions. Freeze until ready to assemble and bake.
Preheat oven to 200°C.
Place the onion, zucchini, peas and capsicum in strips. Arrange herbs over.
Place Parmesan and cheddar into Thermomix bowl and mill for 7 seconds on speed 10. Set aside.
Place peppercorns and salt into Thermomix bowl and mill for 10 seconds on speed 10. Add remaining ingredienst and mix for 20 seconds on speed 6. Pour over vegetables. Sprinkle with grated cheese and bake for 30 minutes. Reduce temperature to 160°C and cook a further 10 minutes. Allow to cool slightly in oven with door ajar before removing.
Cool before serving for best slicing results!