Put the pot on the stove and heat the water to body temperature (37 degrees).
Find a bowl.
Pour the tempered water.
Add yeast.
Let it sit for 7-10 minutes.
Add sugar and salt.
Cut the butter into smaller cubes and add it to the bowl as well.
Add whole wheat flour while stirring.
Gradually add all-purpose flour, stirring constantly, until the dough is smooth and slightly sticky.
Knead the dough thoroughly with your hands in the bowl. Preferably for 15-20 minutes.
Cover the bowl and place it in a warm spot.
Let the dough rise for 30 minutes.
Sprinkle flour on the table.
Turn the dough out onto the flour.
Divide the dough into 12-15 equal pieces.
Roll each piece into tight buns.
Place the buns on a baking sheet lined with parchment paper.
Let the buns rise to approximately double their size, 45-60 minutes under a cloth.
Preheat the oven to 210 degrees Celsius (410 degrees Fahrenheit), using fan mode.
Place the baking sheet with the buns in the preheated oven.
Bake the buns for 10-12 minutes. The baking time depends on your oven, but you can check if the buns are done by lightly tapping the bottom with your fingertips: if it sounds hollow, the buns are ready.