I once boiled some potatoes of average size, by inserting a fork into them I thought they were boiled properly but cutting them in half, I saw the center is still raw with a lighter color. So how should I know it's enough boiling?
How to make sure that potatoes are boiled properly
boilingpotatoes
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Best Answer
You would probably do best to check the internal temperatures of each and every potato. You can do this with a meat thermometer.
[ Source: http://whatscookingamerica.net/Q-A/PotatoBaking.htm ]
(That's 98.8889 degrees Celsius, because I can't read Farenheit.)
Now, baking and boiling are different, and what you are going to end up doing with it or what type of potato you used will have an effect on this. However, you get the general idea. Thermometers will provide the best accuracy for any method of cooking.
If you want to really keep things accurate, you can use the ChefSteps method of selecting potatoes to begin with: http://www.chefsteps.com/activities/finding-perfect-french-fry-potatoes
So all your potatoes have about the same water content.
Then you can cut them all to exactly the same size.
Then you can put them in an immersion circulator/waterbath at 194°F / 90°C, use a special sous-vide bag thermometer to test the internal temperature (it pierces the bag and reseals it on the way out,) and you have the most accurate potatoes ever.
Mmmm, accurate potatoes.