Turn the small oven to 200 Celsius. Before putting the pizza in the electric oven, make sure to bring the small oven to the right temperature. This is especially sensible if you are reheating the whole pizza. Otherwise, if you put the pizza in the oven too early, it will soften in areas where it shouldn't be. Only if you do it right can you preserve the flavor of the pizza.
Put the pizza on a baking sheet and stick it in the oven. If you're given a porcelain baking sheet, it's even better, because the porcelain's structure encourages the ingredients to heat up evenly. If you don't have one, a baking sheet or dish will work.
If there are seasonings on the pizza that don't look fresh anymore, you'll need to get rid of them before putting it in the electric oven.
Cut a little tomato, basil, mushrooms or other fresh fruit on the pizza. You'll also be able to top it with a little vegetable oil or fresh cheese.
Heat for 15 minutes. Check the oven frequently during this time; when the cheese starts to bubble and dark brown spots appear, the pizza is ready. Remove the pizza from the oven and enjoy.
2. Warm the pizza in the oven
Heat the oven to 200 degrees Celsius. It's important to heat the oven before you put the pizza in it, otherwise the interior of the pizza will be ruined. But if you do it right, the hot pizza will have a crispy crust with hot bubbles coming out of the top.
Put the pizza in the oven. Most cake ovens aren't very large, so this method may only work for warming up one or two slices of pizza. If you need to warm up more pizzas, you'll need to do this in several batches.
Warm the pizza for 10 minutes. Keep an eye on the inside of the oven during this time to see if the cheese is just starting to bubble and melt; if it is, the pizza is almost ready.
3. Warm the pizza in a wok
Place a wok over low heat to warm the pizza. This is a good way to warm up thin-crusted pizzas that are a little flaky. If you don't have a wok, a sauté pan can be substituted.
Place the pizza in the wok and cover it with a lid. The purpose of the lid is to melt the cheese and warm the toppings on the pizza, plus crisp up the crust.
Heat the pizza until the cheese just starts to bubble. After about 5 minutes, open the lid and check to see if the pizza is ready. If the cheese is just starting to melt and the crust is getting crispy, you can remove it from the skillet.
If the cheese is already melted, but the crust is still soft, leave it uncovered for another 10 minutes or so.