Finely grate the potatoes and place into a bowl, covering with the hot water. Set aside for 5 minutes.
Meanwhile, place the flour, yeast and salt in a large bowl and stir to combine.
Add the potato mixture to the flour alongside the egg.
Stir together to form a dough and knead until smooth and not sticky to the touch.
Place in a bowl and cover, setting aside in a warm place to rise for 30 minutes.
Sprinkle a little flour over your work surface and invert the dough.
Knead your dough into your desired loaf shape with floured hands.
Preheat your oven to 225C/435F.
Pour 2 cups boiling water into a baking dish and set at the bottom of your oven.
Place the dough onto a lightly floured baking tray and place into your oven. Bake until truly golden, approximately 50 minutes.
Remove and allow to cool completely.
Slice up and serve.
Dig in!