Preheat oven to 180°C. Butter and line a 18 x 26cm baking dish with the puff pastry, bringing pastry right up the sides of the dish. Set aside.
Place cheeses into Thermomix bowl and mill 10 sec/speed 10. Remove from bowl and set aside.
Place rice into simmering basket, insert into Thermomix bowl and add water. Cook 8 min/100°C/speed 3. Drain and set rice aside.
Place onion and EVOO into Thermomix bowl and chop 2 sec/speed 4. Sauté 5 min/Varoma/speed 1.
Add spinach a bowlful at a time and chop 3 sec/speed 5. Repeat until all spinach is chopped
Add zest, lemon juice, eggs, salt and pepper, parboiled rice and grated cheese. Mix for 20 sec/Interval with the aid of the spatula.
Spread into pastry base. Brush each sheet of filo pastry with butter and place on top of mixture to fully cover.Pinch edges to seal pastry. Sprinkle with a scant few sesame seeds
Slash top of pie in a diagonal cross. Bake for 45-50 minutes or until golden and centre is set.
Serve with lemon wedges and a salad.