in his devouring mind 's eye , he pictured to himself every roasting-pig running about with a pudding in his belly , and an apple in his mouth ; the pigeons were snugly put to bed in a comfortable pie , and tucked in with a coverlet of crust ; the geese were swimming in their own gravy ; and the ducks pairing cosily in dishes , like snug married couples , with a decent competency of onion sauce .