Editing Pressure cooker (section)

====Maximum fill levels====
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),<ref name="Wise">{{cite book |author=Wise, Victoria |title=The Pressure Cooker Gourmet: 225 Recipes for Great-Tasting, Long-Simmered Flavors in Just Minutes |publisher=Harvard Common Press |location=Harvard, Mass |year=2005 |isbn=1-55832-201-9|page = 262}}</ref> and no more than one-third full for [[Pulse (legume)|pulses]] (e.g., [[lentil]]s).{{citation needed|date=February 2020}}