How to Make It
Put the celery root slices in a medium saucepan of salted water and bring to a boil. Cook until just tender, about 8 minutes. Drain and pat dry.
Beat the egg in a shallow bowl. In another shallow bowl, season the bread crumbs with salt and pepper. Dip the celery root slices in the egg and then in the seasoned crumbs, pressing to coat.
Melt the butter in the oil in a large skillet. Add the slices in a single layer and cook over moderately high heat, turning occasionally, until golden and crisp, 6 to 7 minutes. Transfer to paper towels to drain. Sprinkle with salt and parsley and serve with lemon wedges.