1. Trim the Ends: Start by trimming the ends off each green bean. This removes the tough, fibrous parts, ensuring every bite is tender.

2. Wash Thoroughly: Rinse the trimmed green beans under cold water to remove any dirt or debris. Pat them dry with a towel to minimize moisture, which helps in achieving the perfect crispness in the air fryer.

3. Boil Water: Bring a large pot of water to a rolling boil. This high heat will quickly cook the outer layer of the beans.

4. Blanch Green Beans: Add the green beans to the boiling water for about 2 minutes. Blanching halts enzyme actions which can cause loss of flavor and color.

5. Ice Bath: Immediately transfer the blanched green beans to a bowl of ice water. This stops the cooking process, preserving their bright green color and crisp texture.

6. Air Fryer Method: For those using an air fryer, preheat it to 350°F (175°C). Spread the sliced almonds in a single layer in the air fryer basket and toast for 3-4 minutes or until golden.

7. Skillet Method: Alternatively, toast the almonds in a dry skillet over medium heat. Stir frequently to prevent burning, until they are golden and fragrant, about 3-5 minutes.

8. Combine Ingredients: In the same air fryer, add the blanched green beans, toasted almonds, minced garlic, and butter. Toss well to ensure even coating.

9. Cook: Set the air fryer to 375°F (190°C) and cook for about 6-7 minutes, shaking the basket halfway through to ensure even cooking.

10. Season: After cooking, add lemon zest, lemon juice, and season with salt and pepper to taste. Toss everything together to distribute the flavors evenly.