Coat Chicken in flour. Heat butter and oil in pan, saute chicken until golden brown. Drain, place chicken in ovenproof dish. Combine lemon rind, lemon juice, tarragon, crumbled stock cube and water in pan; bring to boil, pour over chicken. Bake, covered, in moderately slow oven 1¼ to 1½ hours or until chicken is tender. Spoon juice over chicken when serving.