Put 175g/6oz of rye flour and 75g/3 oz of wholemeal flour into a bowl, then stir in the salt, yeast, malt extract and treacle and 150 ml/1⁄4 pint of the water.
Mix well for 5 minutes, then leave in the bowl to rise for 5 hours.
Line a baking tray.
Add the remaining flours and water and the cumin seeds to the dough and mix well.
Tip out onto a lightly floured surface, divide the dough into two and shape each into an oblong sausage.
Coat each sausage with rye flour, place each in a rye basket and leave to rise for 2–3 hours.
Preheat the oven to 220°C/425°F/gas mark 7.
Tip each loaf out onto the baking tray and bake in the oven for 35 minutes, then transfer to a wire rack to cool.