Searching 'Zaar for the 'it' Cherry Pie recipe and found this on ATK. The amount of sugar and tapioca you use is relative, depending on the fruit’s quality and your taste. If you prefer a less sweet pie or if the fruit is especially sweet, use the lower sugar amount. If you like your pie juices fairly thick, or if the fruit is really juicy, then opt for the higher amount of tapioca. If you are using frozen fruit, measure it frozen, but let it thaw before filling the pie. If not, you run the risk of partially cooked fruit and undissolved tapioca. If using sour cherries instead of sweet, increase sugar to 1 cup and tapioca to 4 tablespoons.