Harold Morgan helps himself to pistachio pudding salad. It is actually a thing, it's a real food. Apparently a desert.
One scene here would appear to be a recreation from Canasta Masta (1995), where Brighton joins his nanny's mother and grandmother's Canasta team. Since The Nanny stole so many premises from Ellen, Ellen soon gave Frannie girl a taste of her medicine. It seems to be the case here.