Fill a medium (3-quart) saucepan three-quarters full of cold water. Set over high heat, and bring to a boil. Add salt and beans. Cook until water returns to a boil and beans are tender, 4 to 5 minutes. Remove from heat, and drain.
Immediately return beans to saucepan. Add butter and zest. Toss; season with salt and pepper. Transfer to a serving bowl; serve warm.
Made this for thanksgiving side and it was a refreshing side from all the heavy stuff. As for quantity, 3-4 lbs of beans was perfect for 35 ppl.
These green beans are fabulous! I made these green beans for Thanksgiving. Even though I trippled the recipe they were gone instantly. I received many compliments, but my grandmother, who is a french chef, was the most complimentary. These were so very easy to make that I almost felt guilty about it. I will definately make these again. They are perfect for either a weeknight meal or a get-together.