Wash the green beans, then trim off the ends of the beans using a knife or kitchen scissors.
Fill a large pot with water and bring it to a rolling boil. You'll need enough water to fully submerge the green beans.
Prepare an ice bath: While the water is heating up, prepare a large bowl filled with ice water. This will be used to immediately cool down the beans after blanching to stop the cooking process.
Once the water is boiling, carefully add the green beans to the pot. Make sure they are fully submerged. Blanch the beans for about 2-3 minutes. The exact time may vary depending on the size and thickness of the beans. You want them to be bright green and slightly tender but still crisp.
Using a slotted spoon or tongs (or drain in a colander), remove the green beans from the boiling water and immediately transfer them to the ice water bath. This will quickly cool them down and prevent them from cooking further.
Once the green beans are completely cooled, drain them from the ice water bath. You can pat them dry with a clean kitchen towel if desired.
Use or store: Blanching prepares the green beans for various recipes. You can use them immediately in salads, stir-fries, or as a side dish. Alternatively, you can store them in an airtight container in the refrigerator for a few days.