how to cook green beans after they've been blanched and frozen
Step 3: Blanch the green beans. 1  Bring a large pot of water to boiling. Allow 1 gallon of water per pound of green beans. 2  Fill a large bowl with ice water. 3  Working in batches, carefully lower the green beans into the boiling water.  Boil small beans for 2 minutes, medium beans for 3 minutes, and large beans for 4 minutes.