Place roux ingredients into the Thermomix bowl and cook 3 min/80°C/speed 3. Cool slightly. Leave in TM bowl.
Add all dough ingredients to cooked roux in the Thermomix bowl and mix 10 sec/speed 6. Knead 4 min/dough setting/Interval. Scrape out onto floured Silpat mat and wrap in a tight ball. Prove until doubled.
Weigh out 1 kg of dough and divide into 3 equal pieces. Create a loaf with the 3 pieces. Cover and allow to double.
Divide remaining dough into 4-6 burger buns. Roll into balls and flatten slightly. Allow to rise, and then brush with egg wash, sprinkle with sesame seeds (optional) and allow to rise again.
Preheat oven to 200°C. Bake loaf for approximately 25 minutes until golden and sounding hollow when tapped. Bake burger buns for 15 minutes until golden and glossy.