Mix the milk, sugar, yeast, psyllium and butter, leave to stand for approx. 15 mins.
Using a food processor, knead the starter dough, flour and all the other ingredients quickly and briefly. Divide the dough into eighths, shape into approx. 30 cm strands that are thinner at the ends. Braid 4 buns, place on a baking tray lined with baking paper. Cover and leave to rise at room temperature for approx. 30 mins.
Baking soda solution
Combine the water and baking soda, brush half of the buns with the baking soda solution and the other half with egg. Place in the lower half of the cold oven. Heat oven to 200°C.
After approx. 40 mins. remove bread, allow to cool on a cooling rack.