Hello! Pressure cooking involves a bit of basic science.
Water boils at 100c. Once you reach boiling point, increasing the flame under a pot simply speeds up the rate of steam - it can't go higher than 100c because it just makes more steam.
With a pressure cooker, the steam is trapped. , so the steam and water have to occupy the same space. Increasing pressure raises the boiling point of water. So you are cooking at 115c-118c. This means that food cooks quicker, but liquids don't reduce, because the steam is not released to the atmosphere.
So two key facts: higher coming temperature (less time to cook) and no water evaporation.
The next thing to know is that to make steam you need water. This is essential, because a thick sauce can't release water enough to produce steam, so there's no pressure. Equally, a pressure cooker relies on steam pressure to know when it's hot enough, so it will keep heating in the hope of reaching pressure, which can burn foods. That sounds scary, but actually, the IP has a safety mechanism to realise that it can't pressurise and will switch to 'overheat' and alarm.
With all that in mind, it's actually really simple. You have three main options:
-Cook the food in a liquid (e.g. soup, stew, casserole, etc).
-Cook food above a liquid (e.g. vegetables, cheesecakes, cakes, dumplings)
-Cook foods 'pot in pot' - all ingredients go into a dish which is put in the IP (eg some people cook lasagna in a cake tin)
The Facebook group 'instant pot community' has over 50,000 members and is a hive of knowledge.
The main points are:
-Reduce the cooking time (eg. Broccoli only needs '0 minutes' on steam).
-add about 1-2 cups of water. If you have a thick sauce, you still need to add extra water to make the steam. If you are cooking a stew with lots of veg, don't use too much water because the veg will also release water.
-if you cook with tomatoes, layer the ingredients so that the tomatoes go in last. The sugar from the tomatoes can catch on the bottom. Food doesn't move around under pressure, so putting them on top stops that.
-if food isn't done after x minutes, just put the lid back on and give it a bit longer.
There are two options at the end of cooking. QPR-quick pressure release- is where you move the top knob to 'vent' and all the steam is released in 2-3 minutes. That's great for delicate foods that will over cook when sitting in the hot put.
NPR -natural pressure release- is where the pot is left to sit after cooking, so the heat dissipates over the lid surface and pressure releases over about 10-15 minutes. This is good for meats, which tend to toughen if you QPR.
Hope that helps!