Bring a pot of salted water to a boil. Prepare an ice bath. Blanch the green beans briefly in the boiling water, then transfer to the ice bath to stop the cooking process. Drain and set aside.
In a large pan on medium-high heat, add the butter, garlic and lemon juice. When the butter is melted and the garlic is fragrant, add the green beans and toss until just heated through. Taste a green bean and season with salt and pepper if needed. Remove to a serving plate and wipe the pan clean. Add the almonds and lemon zest and quickly toast a minute or two. Sprinkle the toasted almonds and zest over the green beans and serve.