Rinse the seeds thoroughly to remove any pulp. Pat dry between paper towels. Put seeds into a shallow baking pan and drizzle them with oil, stirring to coat each seed. Spread the seeds out in the pan and bake at 325 degrees F until golden and crunchy, about 1 hour. Stir frequently to turn. Serve as is or sprinkle with salt. Store unused seeds in an airtight container for up to one month. Retoast stored seeds for about 5 minutes, as needed.