Green beans, string beans, snap beans, haricots verts—whatever you like to call ’em-are the simple, stringy veggies that have graced practically every dinner table. Especially around the holidays.

Sautéing brings out green beans’ flavor while keeping them crisp and vibrant. Blanching first preserves color and texture, but it’s optional for busy cooks. A hot pan and good oil are the keys to ...