Saturday, Feb. 19, 2022 at 2 p.m. on KPBS TV / On Demand. Test cook Erin McMurrer makes host Julia Collin Davison a foolproof Poulet au Vinaigre (Chicken with Vinegar). Test cook Keith Dresser shows host Bridget Lancaster how to make the best Tourte aux Pommes de Terre (French Potato Tart).