In a bowl, add the sunflower seeds and add water until all the seeds are fully submerged. The seeds will soak some water, and this is done to prevent the seeds from becoming too dry on roasting.
Now add salt to the bowl and stir well till the salt is dissolved completely. Leave the seeds soaked in salty water overnight. This will give the seeds a bit of a salty flavor upon roasting.
the next day, drain all the salty water and spread the seeds on the paper towel. Pat with another paper towel to get rid of most of the water.
now, preheat the oven at 300°F. Take a parchment-lined baking tray and spread the seeds evenly. Try not to overlap the seeds. This will ensure even roasting. Keep the tray in the oven for roasting at the same temperature for 30 to 40 minutes. Stir the seeds in between to ensure that they roast evenly on both sides.
After the seeds are roasted, you can either serve them immediately by adding some butter or cool and store them in an airtight jar for future use.