Icelandic Thunder bread
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Icelandic Thunder Bread or Rye Bread

A recipe for Icelandic Thunder Bread also known as Rye Bread
Prep Time15 mins
Cook Time5 hrs
Total Time5 hrs 15 mins
Course: Bread
Cuisine: Icelandic
Keyword: Thunder Bread
Servings: 1 loaf


  • 320 grams rye flour
  • 85 grams flour
  • 200 grans sugar
  • 2 tsp baking powder
  • 1/4 tsp salt
  • 500 ml milk


  • Mix together all the dry ingredients in a medium bowl. Add the milk and mix together. The dough will be very wet.
    Grease a metal pot (with a lid) so the bread won’t stick when it’s cooked. 
    If, like me, you don't have a geothermal spring in your garden(!) Siggi suggests you bake in the oven at 120 degrees Celsius (with the lid on) for five and a half hours, or until bread is cooked in the middle. You could also cook in a slow cooker.
    To convert to cups measurement use this converter.