A study performed by Covance Laboratories in 2008, showed that the following vegetables retained a higher percentage of several vitamins and minerals recommended by the FDA, when using the Royal Prestige® waterless and greaseless method comparing to boiling: broccoli (73%); cabbage (25%); carrots (16%); potatoes (8%).
The same study indicated that cooking with the Royal Prestige® waterless and greaseless method is between 69% and 78% more energy efficient than boiling vegetables and 54% more efficient than roasting in the oven.
Always use a burner similar in diameter to the pan you are using. If cooking on a gas stove, the flame should just touch the bottom of the utensil. The flame should not cover the bottom or extend up the sides of the pan.
Yes, choose a pan size that is appropriate for the amount of food you are preparing; ideally, you should fill the pan 2/3 full. Always use the cover that is intended for the specific pan you are using.
To prevent food from sticking, it is recommended to preheat utensils at medium-high temperature. When cooking, it’s better to keep the temperature between low and medium. High heat may be used when necessary; for example, when boiling liquids.
Temperatures can vary from one stove to another. In general, when the valve whistles you should reduce heat to low and wait until the valve stops whistling before closing it. If while you are cooking there is not steam coming out, you need to slightly increase the temperature. If instead you find that excessive steam is leaking, you should slightly lower the temperature. Remember that the key is that there should be an occasional escape of steam.