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I have one of the really 'old-school' cast aluminium ones that go on the stove (which I bought from a car boot sale). It has a gauge on the lid and two weights (though I only ever use the one), and is 9litres. I love it much more than my slow cooker (which I really think is defective), because 1) you don't need to cook things for 8 hours as has been said, 2) it doesn't require the fore-thought like a slow cooker, 3) its easy to use. I get home from doing all my running around for our business or being at the workshop, and have dinner (as well as probably eight more servings) cooked before I need to go to daycare to pick up the kids. I always let the pressure release slowly; I just turn the gas off, move the PC to the other back hob, and go to daycare.
They don't need a lot of liquid, though I haven't quite worked out how much (or rather how little), and you are not meant to fill them more than two thirds full. There is a great looking **Australian** PC cookbook at the post office for about $15 which looks quite good value (which I want to buy, as long as the Man doesn't notice.... lol). I will find the title if you just wanted to buy it online or something. The other tip, make sure the seal is kept clean and undamaged.
I use my PC probably twice a week, and cook a big lot of food. The last thing I cooked was curried chicken, with onion, garlic, apple, sultanas, coconut, chicken, and a bit of water. Looked kinda vomit like, but tasted great. If I could only keep a few things from my kitchen, my PC would be one of them.
Netix wuvs her PC....
The PC cookbook I was referring to is called "Everyday Pressure Cooker Recipes", Australian Edition, published by Hinkler Books. (Yes, I admit, I did end up getting one). It has a good Intro and information about PC's that is essential reading, especially to the PC novice, including some timing charts for "meat, poultry, game and egg". It has recipes for (and I'm just copying the list from the contents page); soups and stocks, sauces, beef and veal, pork, poultry, lamb, seafood, pasta and rice, vegetables, and desserts cakes and breads.