Combine wholemeal flour, dry yeast, salt, sugar, and lukewarm water in a bowl.

Knead the mixture until a smooth dough forms.

Cover the dough and let it rise in a warm place for 40 minutes.

While the dough rises, heat a frying pan and fry the bacon until crispy.

Add the chopped onion to the pan and fry for 2 minutes.

Allow the bacon and onion mixture to cool.

Line a baking sheet with parchment paper.

On a floured surface, knead the cooled bacon and onion mixture into the risen dough.

Continue to knead for 5 minutes until the dough is supple.

Shape the dough into a loaf.

Place the loaf on the prepared baking sheet.

Score the top of the loaf with a knife.

Let the loaf rest for 20 minutes.

Preheat the oven to 400°F (200°C).

Bake the loaf for 30-40 minutes, or until it sounds hollow when tapped.

Cool the loaf for 30 minutes before slicing.

Spread with butter and serve.