Heat the kefir and water in the microwave for one minute at 800 watts. Mix the flour, grains, yeast, salt and sugar with a spoon, then add the kefir water and knead everything in the food processor for 10 minutes.
Let rise until the volume has doubled. Then shape 2 balls and place in 2 proofing baskets. Let rise for another 45 minutes and then turn out onto a baking sheet. Bake at 200 ° C top / bottom heat for 45 minutes. To start, pour half a cup of water on the bottom of the oven and steam.