You can make your own baking powder by combining 15ml/1tbsp bicarbonate of soda with 30ml/2tbsp cream of tartar. Measure carefully as too much or too little can upset a recipe’s balance.
She would not have made the bread herself, but now after many trials, I'm baking it in my own kitchen. So can you. This is a slow-rise dough made with rye flour, whole-wheat flour, bread flour ...