Prepare an ice bath by filling a large bowl with ice and water; reserve.
Heat a large pot of water until boiling. Stir in 1/2 teaspoon of the kosher salt. Drop in the green beans and boil for 3 minutes. Using a mesh strainer, lift out the beans promptly and plunge them into the ice bath for 1 minute. Drain thoroughly and blot dry.
In a large skillet, heat the butter over medium heat until melted. Add the almonds and garlic; sauté for 2 minutes until the almonds turn golden.
Put the green beans into the skillet. Sprinkle with the remaining 1/4 teaspoon kosher salt. Toss everything together and cook until the beans are tender, roughly 2 minutes. Sample and adjust seasoning with extra salt if needed.