Set your oven to 356°F (180°C) with the fan on. In a large mixing bowl, beat the egg. Stir in the yogurt, olive oil, baking soda, and a small pinch of salt. A whisk is all you need (no mixer required).
Add the buckwheat flour and mix until the batter is thick and smooth. The texture should be a heavier than pancake batter.
Place a frying pan on medium heat and lightly toast two-thirds of the sesame seeds. This step boosts their flavor and gives the bread a richer, nuttier taste.
Stir the toasted sesame seeds into the dough until they’re evenly distributed.
Line a loaf tin with parchment paper. Carefully transfer the dough and use a spatula to spread it evenly. The mixture will be sticky, so take your time.
Scatter the rest of the sesame seeds over the top and slide the tin into the oven. Bake for about 45 minutes.
During baking, the loaf will naturally crack on top — that’s exactly how it should look. The crust will turn a rich brown, and the sesame seeds will darken. Start testing around 40 minutes with a toothpick: if it comes out clean, the bread is done.
Take the bread out of the oven and lift it from the pan together with the parchment. Because this loaf uses only buckwheat flour, it will be delicate when hot, so let it cool before cutting.
You're all done! Slice it and serve with your favorite toppings or alongside a hearty meal. Enjoy!