Cook the Vegetables: In a large skillet, melt the butter over low-medium heat. Add the onion, celery, and garlic. Sauté for 6-8 minutes or until vegetables are softened. Season with sage, thyme, rosemary, salt, and pepper.
½ cup unsalted butter, 1 medium onion, 2 celery stalks, 2 to 3 garlic cloves, 2 teaspoons dried sage, 1 teaspoon dried thyme, 1 teaspoon dried rosemary, 1 teaspoon salt, ¼ teaspoon ground black pepper