Bring a large pot of salted water to a boil.
- Add green beans and blanch for 3-4 minutes until bright green and tender-crisp.
- Drain and transfer to ice water to stop cooking; drain and pat dry.
- In a large skillet, melt butter over medium heat.
- Add sliced almonds and cook, stirring frequently, until golden and fragrant, about 2-3 minutes.
- Stir in minced garlic and cook for 30 seconds until fragrant.
- Add green beans and toss to coat in butter and almonds.
- Cook for 2-3 minutes until heated through.
- Remove from heat, stir in lemon juice, season with salt and pepper.
- Garnish with lemon zest if desired and serve warm.