Bring a large pot of salted water to a boil. Add the seeds and boil for 10 minutes. Drain and dry on a paper-towel-lined baking sheet for 30 minutes to 1 hour.
Preheat the oven to 325 degrees F.
Pat the seeds dry with a paper towel once more. Dump and scatter the seeds onto a baking sheet and toss with the oil, some salt and the seasoning if using. Arrange the seeds in a single layer. Bake, stirring every 5 minutes, until puffy and light golden brown, 15 to 17 minutes (you will also hear them pop in the oven). Let cool on the baking sheet.
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