Heat two pans, placing a little oil into both of them. Place the carrots in one of the pans. In the other pan add the onion first of all and when it starts to acquire a golden colour, add the peas. It will take about 20 minutes to cook the carrots and peas. The time will vary depending on the thickness of the carrots, the degree of crispness desired and the difference between fresh and frozen peas. For both vegetables a little water may be added as they are cooking to let them become softer At your own discretion a pinch of salt may be added when cooking the vegetables.