preheat the oven to 350°
If you have trouble controlling the heat on the stove top, preheat your oven to 450 degrees and finish the dish in that by putting the whole pan in.
preheat the oven to 200°C
Always preheat oven before using unless chart or recipe indicates otherwise.
If you are grilling your kebabs, preheat your grill to medium-high.
Simply preheat the oven to 200C, and prick as many kumara as you need with a fork (allow about one each, depending on their size).
When the quinces are cool, preheat the oven to 180C / 350F / Gas Mark 4.
Finally she managed to explain that whoever had preheated the oven had only set the temperature, and hadn't turned the other dial to on.
She preheated the oven and immediately began setting out the ingredients on the counter.