Bake sliced almonds in a shallow pan at 350° for 5 to 10 minutes or until toasted. Set almonds aside.
Split beans lengthwise.
Cook beans in boiling water to cover in a Dutch oven 4 minutes or until tender; drain.
Melt butter in Dutch oven; add almonds, beans, lemon juice, salt, and pepper, tossing to coat. Serve immediately.