Add the buckwheat flour and kefir in a glass bowl. Allow to soak overnight or at least 12 hours.
Preheat oven to 200.
Sieve dry ingredients into a glass bowl. Add wet ingredients. Try to mix as little as possible. Leave in the bowl for 10 minutes.
Add flour to hands. Place dough (leave it in the shape it took on from the bowl) on greased parchment paper on a baking sheet. Dust lightly with a bit of all-purpose gluten-free flour and cut a deep cross in the top.
Bake for 30 mins until brown on the outside.
Calories: 1174kcal | Carbohydrates: 165g | Protein: 43g | Fat: 44g | Saturated Fat: 8g | Cholesterol: 30mg | Sodium: 2571mg | Potassium: 915mg | Fiber: 21g | Sugar: 34g | Vitamin A: 490IU | Calcium: 500mg | Iron: 9.4mg