Cut fresh beans into 1-inch pieces (or, slice lengthwise for French-cut beans). Cook fresh green beans, covered, in a small amount of boiling salted water for 10 to 15 minutes (5 to 10 minutes for French-cut beans) or until crisp-tender. (Or, cook frozen beans according to package directions.) Drain; keep warm.
Meanwhile, in a small saucepan cook and stir almonds in melted butter over medium heat until golden. Remove from heat; stir in lemon juice. Stir almond mixture into beans.