Preheat oven to 350F.
Place thinly sliced red potatoes in the glass bowl. Add salt and black pepper, and stir gently to cover the surfaces of the potatoes
Cover red potato mixture with cream, and gently stir until well coated. Drain the potato slices and retain the cream mixture.
Butter the stainless steel bowl.
Layer the red potato slices around the bottom of the bowl, and well up the side.
Place thinly sliced yellow potatoes in the glass bowl. Add salt and black pepper, and stir gently to cover the surfaces of the potatoes
Cover yellow potato mixture with cream, and gently stir until well coated. Drain the potato slices and retain the cream mixture.
Layer a quarter of the yellow potato slices in the middle of the stainless steel bowl, on top of the red potato slices.
Layer 4 slices of Cheddar cheese on top of the yellow potato slices.
Layer a quarter of the yellow potato slices, covering the Cheddar cheese. Keep the yellow potato slices in the middle.
Cook the bacon slices in a frying pan or griddle.
Layer the bacon slices on top of the yellow potato slices.
Layer a quarter of the yellow potato slices over the bacon, gradually covering more of the red potato slices as you go.
Sprinkle the scallions over the yellow potato slices.
Layer the remaining yellow potato slices over the scallions, until they almost, but not quite, cover the entire contents of the bowl.
Layer the remaining Cheddar cheese slices over the contents of the bowl.
Cover the entire contents with the pastry dough.
Bake in the oven for about 80 minutes at 350F.
Take the stainless steel out of the oven, and invert its contents onto a baking dish. The result will look like a large cake. Bake in the oven for another 10 minutes at 350F