Convection oven cooking is part science, part experiment. The ovens vary by manufacturer; they have different sized cavities and the fans work at differing speeds. Experimenting with how long it takes to prepare vegetables in the convection oven is the best way to determine the right cooking times. Test the vegetables with a fork to determine when they are well roasted.
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The Right Baking Dish
A fan placed at the back of a convection oven pushes heat from the heating element around the cavity of the oven, unlike a conventional oven where stagnant heat emanating from the bottom heating coil cooks the food. The constantly moving heat cooks food faster. Using a high-sided baking dish prevents the heat from accessing all faces of the vegetables inside. Instead, use a short-lipped baking tray or low sided baking dish, no more than 1 1/2-inches high, to cook your vegetables. Aluminium and metal pans work best, including the throwaway baking containers.
Preparing the Vegetables
Wash and completely dry the vegetables. Cut into pieces of a similar size. Place the vegetables that take the longest to cook, like carrots, onions, turnips, parsnips and potatoes, in the pan for the first part of the cooking process. Prepare a roasting marinade. It can be as simple as olive oil, crushed garlic and seasonings. Drizzle on top of the vegetables and place the pan in an unheated oven. The marinade keeps the vegetables moist and adds flavour. Add softer vegetables like eggplant and zucchini as the other vegetables soften. Baste with the marinade as the vegetables roast. Do not use butter as a marinade because it burns.
When first using the convection oven you have to experiment with the cooking times. Most come with instruction booklets and they should be used as your initial reference. Generally, vegetables become well-roasted in an oven set at 176 degrees C and cooked for one hour. Set the convection oven between 190 and 204 degrees C. but reduce the cooking time. Another approach is to reduce the temperature by -3.89 degrees C and cook for the normal length of time. A third experiment is to decrease the temperature -9.44 degrees C and shorten the cooking time.
Never cover the oven racks with foil. This prevents air from circulating and diminishes the effect of the convection cooking. Keep the pan at least one inch from the sides of the oven so the air can circulate. Experiment with roasting techniques. Using a low temperature dehydrates and roasts the vegetables. Medium temperatures cook the vegetables evenly, but be sure not to mix hard and soft vegetables in the same pan and do not roast all the vegetables for the same length of time. Roasting at a high temperature will caramelise onions and give the vegetables a crispy skin.
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