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In page Pressure cooker:

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The recommended maximum fill levels of food/liquid avoids blockage of the steam valve or developing excess pressure: two-thirds full with solid food, half full for liquids and foods that foam and froth (e.g., rice, pasta; adding a tablespoon of cooking oil minimizes foaming),[1] and no more than one-third full for pulses (e.g., lentils).[citation needed]