Preheat the oven to 350 degrees Fahrenheit. Clean and dry the seeds, removing all pulp. Toss them in olive oil, cayenne and salt. Spread them on a sheet pan in a single layer. Roast them in an oven for 15 to 20 minutes until they're crispy and golden. For a savory version of the same snack, substitute salt for sugar and cayenne for cinnamon.