Put water, wheat kernels, and flaxseeds in a pot and slowly bring the ingredients to a boil.
When it boils, turn off the pot and let the mixture steep for 30 minutes.
Pour into a bowl and stir in salt, honey, oil, and A38.
When the mixture is lukewarm, stir in the yeast.
Coarsely grate the zucchini and stir it in.
Gradually stir in the flour until you have a soft dough. It should not be kneaded by hand, but it should hold together well.
Stir the dough for at least 5 minutes.
Sprinkle the surface with flour and let the dough rise, covered with a damp cloth, for about 3 hours.
Turn the dough out onto a floured surface without handling it too much.
With a fairly large spoon, shape the dough into buns directly on a baking sheet with parchment paper.
Sprinkle the buns with a little flour and let them rise for about 30 minutes.
Bake the buns at the bottom of the oven at 220 degrees Celsius (428 degrees Fahrenheit) for 20-30 minutes. They should sound hollow when you tap their bottoms.
Cool them on a wire rack.
The buns can be frozen.