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Foods that can make a pressure cooker explode while cooking
23rd August, 2026 08:40 AM
A pressure cooker has become a useful kitchen shortcut, especially when preparing foods that normally take a long time to soften. Beans, tough cuts of meat and some grains can cook much faster because the sealed pot traps steam and raises the cooking temperature.
However, not every food is suitable for pressure cooking. Some foods foam, expand or become thick during cooking. When this happens inside a sealed cooker, the food can rise towards the steam-release valve and block it.
A blocked valve can prevent steam from escaping as designed, allowing pressure to build up. This is one of the reasons certain foods should either be avoided or prepared only according to the manufacturer’s instructions.
Pasta can foam and swell
Pasta is one of the foods that needs extra caution in a pressure cooker. As it cooks, it absorbs water and releases starch, which can make the liquid thick and foamy.
The foam can move towards the pressure-release valve and interfere with steam escaping. According to Instant Pot, high-starch foods such as pasta should not be subjected to quick steam release because they can produce thick liquid and foam.
For this reason, pasta is better cooked using a conventional pot unless the pressure cooker manufacturer specifically provides instructions for it.
Dried beans expand as they cook
Dried beans are another food that can cause problems because they absorb water and increase significantly in size. They can also produce foam while cooking.
If too many beans are placed in the cooker, the expanding food and foam can reach the valve and cause a blockage. A pressure-cooking safety guide recommends keeping foods such as dried beans, grains and soups to no more than half the cooker because they expand during cooking.
This means beans are not necessarily forbidden in every pressure cooker, but they require careful preparation, limited quantities and the correct cooking instructions.
Oatmeal and other cereals can froth
Oatmeal, porridge and some other cereals can become particularly troublesome because they produce a thick mixture and may froth during cooking.
The mixture can move into the steam outlet, potentially blocking it. Foods including cereals, pasta, applesauce, cranberries and dried soup mixes are among those that are not recommended for pressure cooking because they can foam and froth.
Applesauce and cranberries can create foam
Applesauce and cranberries may not seem dangerous when prepared normally, but their behaviour changes inside a pressure cooker.
These foods can break down, bubble, and create froth as they heat. The resulting foam can interfere with the pressure-release system, especially when the cooker is overfilled.
For this reason, they are better prepared using an open saucepan where the bubbling can be monitored.
Milk and thick sauces need caution
Milk and large amounts of oil are also poor choices for pressure cooking. Milk can foam and form a layer on the surface as it heats, while thick sauces may interfere with the cooker’s valves.
Some pressure cooker manufacturers specifically warn against using milk or large amounts of oil under pressure. Thick foods such as heavy sauces and curries are also better cooked without pressure when possible.
Why the cooker can become dangerous
The danger is not that these foods automatically make a pressure cooker explode. The problem occurs when food or foam blocks the steam-release system while the cooker is under pressure.
A blocked vent can interfere with normal pressure regulation. Modern pressure cookers have safety features designed to prevent dangerous pressure build-up, but these should not be treated as a reason to ignore food restrictions.
