One of most difficult things I find to do in the kitchen, is to boil a pan of frozen peas.
I just couldn't manage it without the pan boiling over. Even standing hawk-like at the hob waiting to turn down the heat as it reached a boil proved fruitless.
At the crucial moment of boiling point, something would always break my concentration (phone-call from mother, dog barking for no reason, toast burning, need the loo) and half the contents of the saucepan would pill all over the hob - again!
Then I discovered a tip, where placing a wooden spoon over the top of your pan in the centre, prevents it from boiling over.
Obviously, I completely dismissed this as an old wive's tale, but after another half dozen pea tsunamis on the hob, I decided desperate measures were needed and gave it a try.
Don't ask me how, and it's not 100% foolproof, but it's something to do with the spoon being cooler than the liquid in the saucepan , so when the water boils up ready for its freedom, the bubbles burst when they hit the spoon and the liquid reduces. Wow!
It works nine times out of ten, which is good enough for me, and now boiling a pan of peas is part of my culinary repertoire.
Oh, and it works for things like pasta too.