You can buy your sunflower seeds roasted or roast them yourself. To roast sunflower seeds put them unshelled, in a 300* F oven for thirty minutes. For a fully roasted taste, leave them in the oven for sixty minutes. Allow them to cool, then remove the shells. You can roast the shelled sunflower seeds but the flavor is better with the shells left on - they will not take as long unshelled.
Combine sunflower seeds with oil in a blender or food processor and blend, stopping periodically to scrape the sides of the blender. You may need to add more oil, 1/2 t at a time blending between additions. Add a bit of salt to taste.
You should store this in the refrigerator. If the oil seperates just stir it up.