In the rush to cook, don’t ever fill the cooker with too much water. A good rule is to fill the cooker only up to three-fourths of its capacity with food and water. If you add too much, it’s only natural that water will spill out when the whistle blows.
Start with a high flame, but once the cooker heats up, switch to a medium flame. This ensures your food cooks evenly and also reduces water spillage.
The Spoon or Small Bowl Method
When you’re boiling dal or potatoes, just drop a small stainless steel spoon or a small steel bowl inside the cooker with the food. This little object helps control the intense boiling inside, preventing too much foam from forming and spilling out through the whistle.