How do you adjust a cake mix recipe when adding pureed fruit?

Answer:
Pureed fruit significantly changes the composition of a batter because it not only adds liquid, but - depending on the type of fruit - might completely alter the acid balance. Leavening agents such as baking soda and baking powder depend on a certain acid level. So if you want to add pureed fruit to a batter, you must first reduce the amount of other liquid to compensate for the liquid in the puree. Then you could TRY adding additional baking soda to balance the fruit's acidity; perhaps add 1 teaspoon baking soda for each cup of fruit puree. ... Remember that baking is basically chemistry. You may have to experiment with several different adjustments, and dispose of several flat, dry or soggy cakes, before finding your successful recipe.
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