Blanch the beans. Bring a large pot of salted water to a boil. Add green beans and cook for 3–4 minutes until bright green and crisp-tender. Drain and rinse under cold water to stop cooking.
Toast the almonds. In a large skillet over medium heat, melt 1 tablespoon of butter. Add almonds and cook for 2–3 minutes until lightly golden, stirring often. Remove almonds and set aside.
Sauté and combine. In the same skillet, melt the remaining butter. Add garlic and cook for about 30 seconds. Add green beans, salt, and pepper. Toss for 2–3 minutes until warmed through.
Finish and serve. Add toasted almonds and drizzle with lemon juice if using. Toss gently to combine, then transfer to a serving dish.
Notes
Make-ahead: You can blanch the green beans several hours ahead. Cool, pat dry, and refrigerate. Finish the sauté just before serving.
Variations: Add a sprinkle of Parmesan cheese or use pecans instead of almonds for a Southern touch.
Color tip: Don’t skip the cold-water rinse after blanching — it helps the beans keep their bright green color.