Make the pastry dough

1. Mix the flour and salt and put in a food processor.
2. Add the chilled butter cubes and pulse a few times to combine.
3. Add the shortening and pulse a few more times, until the dough resembles a coarse cornmeal, with some small pieces of butter.
4. Slowly add the ice water, a tablespoon at a time, pulsing after each addition. The dough should stick together when you press it between your fingers.
5. Place the dough on a clean surface and mould into a ball using your hands.
6. Sprinkle with a little flour, wrap with plastic wrap, and refrigerate for 30 minutes.

Make the filling

1. Heat the oil and 1 tsp butter in a pan.
2. Add the onions and garlic and saute till brown.
3. Add all the vegetables and spices.
4. Cover and cook on medium flame till the mushrooms have become tender.
5. Remove the cover and saute on high flame to remove any excess liquid.
6. Remove from heat and keep aside to cool.

Put it together

1. On a floured surface, roll out the dough to 1/4 inch thickness. You can also roll it out between cellophane sheets in case it is sticking to your surface. Cut off the edges and make a rectangular shape.
2. Butter the surface, top with the mushroom mixture and then some cheese.
3. Sprinkle with black pepper and roll the dough into a swiss roll like shape.
4. Using a sharp knife, cut 1 inch thick rounds from this and refrigerate for 20 minutes.
5. Grease a baking dish and bake the wheels at 350°F (180°C) for 20-25 minutes, or till the dough has cooked and begins to brown.
6. Cool slightly and serve warm or at room temperature.