When ready to use, simply reheat in a 350 degree F. oven for 30 to 40 minutes, or until warmed through. If you know you are going to use the stromboli, take it out of the freezer and let it defrost in refrigerator for a few hours.Click to see full answer. Hereof, how do you reheat a stromboli?You can just slice the stromboli and freeze it, wrapped in foil, then in a plastic bag. To reheat, warm the foil-wrapped stromboli in the oven for about 20 – 30 minutes at 375 degrees. The time it takes to warm may vary depending on how much you are warming at once and the thickness of your slices.Subsequently, question is, how do you reheat frozen pepperoni rolls? Pepperoni Rolls can be frozen. Wrap in tin foil before freezing. To use, unwrap the Pepperoni Rolls and let thaw for about three hours. Warm in heated oven (400 F / 200 C) for about 15 minutes. Furthermore, can I cook frozen Stromboli? Baking instructions: Oven: Cook from frozen. Keep Stromboli in clear outer wrapping to bake. Bake in preheated oven at 400 degrees F for 32-37 minutes. Bake in preheated oven at 400 degrees F for 12-15 minutes.How do you reheat a frozen calzone?Heat the oven to 400 degrees Fahrenheit for 20 minutes. Place the calzone directly from the refrigerator, unwrapped, onto a baking sheet. Wrap frozen calzones with aluminum foil before putting them on a baking sheet. Bake the calzone for 15 to 18 minutes.