Bring a large pot of water to a rolling boil
Prepare a bowl of ice water
Trim green beans
Add green beans to boiling water
Blanch for 2–4 minutes, depending on thickness
Transfer green beans to the ice water immediately
Cool until completely chilled, about 1–2 minutes
Drain well and pat dry
Use immediately, or store in the refrigerator up to 3–5 days, or freeze after drying thoroughly