Panaskan oven dengan suhu 230°C dan pastikan posisi rak sudah berada di bagian teratas pada oven agar tingkat kematangan roti lapis dapat lebih sempurna. Olesi salah satu permukaan roti dengan mentega.

I'm interested in that, but I only have a few mins. Can you give me at most the first 500 characters of a detailed explanation in English about that?
Check that one of the racks inside your oven is in the top position so your grilled cheese cooks thoroughly. Turn the oven on to 450 °F (232 °C) and let it heat completely while you prepare your sandwiches. Once the oven is up to temperature, you can cook your sandwiches. You can also use a toaster oven if you don’t want to heat up your regular oven. Choose your favorite type of bread to use for your sandwich. Use 2 slices of the bread and spread room temperature butter on 1 side of each slice.