Green and Wax Beans with Walnut Gremolata

from DayRecipe.com 3/4 pound green and/or wax beans, trimmed 1 tablespoon unsalted butter 1/2 tablespoon olive oil 2 tablespoons chopped walnuts 1 garlic clove, minced 1 tablespoon chopped fresh parsley leaves 2 teaspoons fresh lemon juice 1/4 teaspoon lemon zest...