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For example, I often make banana bread. I'd like to effectively keep the same recipe but use pumpkin instead. Bananas are ~72% water while pumpkins are ~90% water, and roughly a 20% increase in water content seems substantial. (I actually have a loaf of apple-bread in the oven; and apples are about 80% water—we'll see how it goes. :D)

I wouldn't be surprised if there were other things I'm not taking into consideration (e.g. - chemical composition of fruits) that affect any substitutions I make. This being said, is there some heuristic I can use when substituting fruits in baking? Or are the differences between fruits enough to warrant totally different approaches when going from fruit to fruit?

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    How did the apple bread go? – anotherdave Mar 23 at 10:32
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    can't you find a proper recipe for pumpkin bread or apple bread ? – Max Mar 23 at 11:53
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    @Max Yes, but I already know how to do that—which is why my question isn't "How do I find a recipe for bread with another fruit in it?" :P – AmagicalFishy Mar 23 at 13:26
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    @anotherdave It came out excellently! Surprisingly, it cooked for less time than the bananna bread before it was ready (I eyeballed the apples vs. banannas, so I may have put too few apples), but it was delicious none the less. :) Pumpkin's next. – AmagicalFishy Mar 23 at 13:28
29

There's no trick, there's math. 100g of banana is about 75g of water (1g of water is 1ml, so easy to measure), 12g of sugar, and 13g of fiber and other stuff. A pumpkin is about 92g of water and 3 grams of sugar, leaving 5g of other stuff.

My banana bread recipe calls for 2 medium bananas, that's about 250g of banana. That's 188g of water and about 30g sugar. If you add 250g of pumpkin instead that's 230g of water and about 8g of sugar, so pumpkin would add 42g of water (42ml, a bit less than 1/4 cup), and take 22g of sugar. That's enough of a difference to really throw your recipe out, so you'd want to remove 42ml of water, milk or other liquid and add 22g of sugar (4g of sugar is about 1 tsp, so 22g is about 5.5 tsp, or just under 2 tbsp).

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    Seems like an excellent starting point. The new measurements may or may not need additional tweaking. – MaxW Mar 22 at 2:30
8

Baking is part science, part alchemy, and part luck. There are so many variable you can't control when you bake that you really need to use your senses and instruments to determine when something is done.

If you are substituting in a recipe, you definitely want to account for the water difference, so this is an astute question.

If you can estimate how much additional water is in the substitution (or how much less), then you can adjust for that with other ingredients. Sometimes you can add in juice or water or milk, but keep in mind that it's not only the water you're changing when you alter the recipe. You are also altering the sugar content which can affect a bake, and adjusting the amount of milk in a recipe to account for water difference in fruit is also altering fat and protein.

Many recipes are fairly robust, and you are fine making these changes and may just need to adjust the cook time to make sure the product is not over- or under-baked.

I'd suggest thinking through the alterations you want to make and do your best to make appropriate adjustments and then see how it comes out. Is it baked well? How is the crumb? Did it not rise as much as normal or too much? Is it too sweet? You can then make other adjustments the next time you bake it to account for these side effects.

What's great about baking is that it's like working in a lab and experimenting, and in the end you get to eat pumpkin bread. And even if it's not perfect, it's probably still pretty good. And you have an excuse to make it again.

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    Hi. Thanks for the answer. :) You say "Sometimes you can add in juice or water or milk..." and (if I'm reading you correctly), this is what one might do when they're moving from e.g. - a fruit with lots of water to a fruit with less water, right? Is there a counter-ingredient one can use when moving from a fruit with less water to a fruit with more water (outside of, as you suggested, baking for longer)? (In other words, I wouldn't know, for example, what to adjust if my bread came out too mushy because the fruit I used had a lot more water. More flour, maybe?) – AmagicalFishy Mar 21 at 18:44
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    Sorry for the confusion, magical fishy. :o) I was trying to answer more generally. For substituting a wetter fruit you may need to remove liquid elsewhere. Depending on the recipe there may be an easy choice (like milk) or not. If removing milk you could try half-and-half (10% fat) or cream (36%ish). You could also parcook the food to remove moisture before adding. You may need to cool first so you're not activating your baking powder etc. I've baked pies with apple where I parcook them to get the moisture content right before baking. Corn starch can also be used to soak up water. – myklbykl Mar 21 at 19:29
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    Ah! Excellent. Thank you for both the specific and general advice. :) – AmagicalFishy Mar 21 at 19:48
5

I'm sure that there area a zillion recipes for both breads. I found a recipe for two 9x5 loafs.

  • Pumpkin bread using One 15-ounce can pure pumpkin puree.
  • Banana bread using eight very ripe bananas (unpeeled, about 32 ounces?).

Most of the ingredients are similar, but the seasoning varies. I assume that the desire with the pumpkin bread recipe is to have the pumpkin bread taste something reminiscent to pumpkin pie.

+--------------------------------------------+-------------+-----------+
|                                            | Pumpkin     + Banana    +
+--------------------------------------------+-------------+-----------+
| cups all-purpose flour                     |    3 1/2    |    4      |
+--------------------------------------------+-------------+-----------+
| cups sugar                                 |     3       |    2      |
+--------------------------------------------+-------------+-----------+
| cup vegetable oil                          |     1       |   1/2     |
+--------------------------------------------+-------------+-----------+
| large eggs, lightly beaten                 |     4       |    4      |
+--------------------------------------------+-------------+-----------+
| cup water                                  |    2/3      |           |
+--------------------------------------------+-------------+-----------+
| teaspoons baking soda                      |     2       |    2      |
+--------------------------------------------+-------------+-----------+
| teaspoon baking powder                     |     1       |    2      |
+============================================+=============+===========+
   SPICES / SEASONINGS                             
+============================================+=============+===========+
| teaspoons fine salt                        |     2       |    2      |
+--------------------------------------------+-------------+-----------+
| teaspoon ground nutmeg                     |     1       |           |
+--------------------------------------------+-------------+-----------+
|  teaspoon ground allspice                  |     1       |           |
+--------------------------------------------+-------------+-----------+
| teaspoon ground cinnamon                   |     1       |    2      |
+--------------------------------------------+-------------+-----------+
| teaspoon ground cloves                     |    1/2      |           |
+--------------------------------------------+-------------+-----------+

So the pumpkin bread uses about half the fruit, and actually adds water.

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    About 1/3 of the weight of a banana is peel, so eight bananas is about 21 ounces (compared to 15 ounces for the pumpkin). I wish we had more answers like this that quantitatively compared different recipes. – Mark Wildon Mar 22 at 9:36
  • @MarkWildon - I already figured weight of unpeeled bananas. cooking.stackexchange.com/a/57784/40279 – MaxW Mar 22 at 16:49
1

Cooks Illustrated solved this problem in their pumpkin cheesecake recipe by removing the water from the pumpkin puree. They simply spread the puree on a towel or paper towel.

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0

another method for completeness that also uses math:

try to match the target water percentage

subtract water: weigh out pumpkin weight of (banana recipe grams of banana) * (.90/.72) and dehydrate to reach that weight

likewise for fruit with less water if the substituting dried figs at about 24% water, weigh out figs = (banana recipe grams of banana) * (.24/.72) water = (banana recipe grams of banana) - (figs weight) mash that weight of figs into that amount of water. with figs and water, finely chop the figs, add water, and leave covered in the refrigerator overnight for the figs to absorb the water, mash until it's a consistent mush, ends may not rehydrate, so discard any remaining hard bits

you're right on the other parameters

  1. between different fruits, there may be difference in acidity, as in pH not sourness, that will affect how much baking powder is needed
  2. sugar content can be adjusted similarly to the weight method above etc.

here's the big one, though: flavor. pumpkin, like apple, is relatively a much weaker flavor than banana. to get the same amount of flavor, you'll want to add more pumpkin that's more dehydrated, but that will definitely affect the way you calculate the amount of water in your final recipe that will take some data gathering:

  • how much weight in water is lost during baking a normal loaf of banana?
  • how much more reluctant to giving water up is pumpkin than banana? (affects cooking time and temp, so cook to minimum internal temp, but at a lower cooking temp so the crust is still edible)
  • etc.

matching the flavor concentration of banana bread may not be achievable without seriously negatively affecting the texture of the loaf, so that's when you start to consider other ways to add more pumpkin flavor, like pumpkin flavor extract. but again, this sometimes leads to qualities that "just don't seem right" after you've smeared butter on a still-warm slice from the loaf.

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    at no point in that answer does "banana grams" appear – pleasePassTheCheese Mar 23 at 11:41

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