Mix the flour, instant yeast, salt and sugar in the bowl of a stand mixer. Pour in the lukewarm water and knead for 5-10 minutes on medium speed until you have a smooth yet wet dough. Set aside a handful of sunflower seeds for later, and fold the remaining sunflower seeds into the dough.
Cover with a damp tea towel (or plastic wrap), and let it rise at room temperature for one hour.
Grease a 12 inch loaf pan with a little oil or butter.
Knead the dough again briefly, and transfer into the prepared loaf pan.
Sprinkle with the remaining sunflower seeds.
Cover with a damp tea towel, and let it rise for another 30-60 minutes at room temperature, until the dough has gained plenty of volume.
Preheat the oven to 430°F (220°C).
Bake the bread for 45 minutes and reduce oven temperature to 390°F (200°C) after 15 minutes.
Remove the bread from the oven, let it cool for 10 minutes, then remove from the pan, and let it cool completely on a rack before slicing
Notes
Keeps fresh for 2-3 days if packed in a tea towel.Or freeze the bread right after baking for up to 3 months. → You can slice the bread before freezing and thaw single slices in the toaster.Active Dry Yeast: If you only have active dry yeast at hand, dissolve it together with the sugar in the lukewarm water before adding it to the flour.