Pumpkin Flan with Spiced Pumpkin Seeds

Name: Pumpkin Flan with Spiced Pumpkin Seeds
Ingredients: 2 cups sugar; 1 1/2 cups heavy cream; 1 cup whole milk; 5 whole large eggs plus 1 large egg yolk; 1 (15-ounce) can solid-pack pumpkin (1 3/4 cups; not pie filling); 1 teaspoon vanilla; 1 1/2 teaspoons ground cinnamon; 1 teaspoon ground ginger; 1/4 teaspoon ground nutmeg; 1/4 teaspoon salt; 1 cup green (hulled) pumpkin seeds (1/4 pound; not toasted); 1 teaspoon vegetable oil; 1/2 teaspoon salt; 1/8 teaspoon cayenne; a 2-quart soufflé dish or round ceramic casserole dish