Ingredients

• 460 g / 1 lb 1 oz (31/2 cups) rye flour
• 260 g / 9 1/4 oz (2 cups plus 2 tablespoons) plain (all-purpose) flour
• 1 litre / 34 fl oz (4 1/4 cups) cultured milk
• 400 g / 14 oz (1 cup plus 2 tablespoons) golden syrup
• 15 g/ 1/2 oz (1 tablespoon) salt
• 3 teaspoons bicarbonate of soda (baking soda)

Instructions

1. Line a 3-litre/101 fl oz (121/2-cup) heatproof vessel, pot or bucket with a lid with some baking (parchment) paper.
2. Mix all the ingredients together in a bowl until fully combined, then transfer to the prepared vessel.
3. If you do not have access to a suitable geothermal area, place the vessel – with the lid on – in the oven at 90ºC/195ºF for 12 hours. Let the bread cool completely on a wire rack before cutting into it.