Bring a stock pot of salted* water to a rolling boil and prepare a bowl of ice water.
Blanch green beans in the boiling water until bright green in color and tender crisp, roughly 2 minutes. Drain and shock the green beans in a bowl of ice water to stop cooking.
Heat a large heavy skillet over medium heat. Add the oil*, shallots, garlic and red pepper flakes and saute until fragrant and a little browned, about a minute or two.
Add the beans, vegetable stock, and continue to sauté until coated in the oil and heated through, about 2-3 minutes. Make sure not to overcook–they’re great with a bit of a bite, crispiness.
Add lemon zest, season with salt and pepper, and toss.