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Sourdough discard batter is a really easy way to use up extra sourdough starter and turn your favorite vegetables, chicken or fish into a crispy, lightly fried delight! This ingenious technique not only helps reduce food waste but also adds a delightful tang and a touch of artisanal flavor to your favorite dishes. Whether you’re a seafood aficionado, a poultry lover, or a veggie enthusiast, this versatile batter will elevate your food to new heights.

My absolute favorite is sourdough discard fried zucchini and chicken (sprinkled with some herb salt).
Tried the sourdough discard batter recipe with butterfly shrimp tonight. Used a pale ale instead of seltzer…it was AMAZING! Light, so crispy. Family said it was better than restaurant shrimp”.

Ingredients
- Sourdough Starter – You can use either active sourdough starter or sourdough discard, whatever you have on hand.
- Seltzer Water – I use seltzer water that I make using my soda stream – but you can use any store bought carbonated water (it could be called sparkling mineral water, soda water or carbonated water depending on where you live). You can use beer instead of seltzer water if you wish, this will add more color and flavor to your batter. I love using beer when we are frying fish in this sourdough discard batter.
- Baking Powder
- All-purpose Flour – for dusting
- Vegetable Oil – If you do not have vegetable oil you can fry in canola oil, rice bran oil, peanut oil or grapeseed oil. You want a light flavored oil that won’t add too much flavor to the food you’re frying.
- Salt – for sprinkling

How To Make Sourdough Batter
Creating a batter from your sourdough starter or sourdough discard is so easy! You literally just need to thin it out a little and add some extra “puff” and you’re away!
Slice your meat or vegetables into small pieces – you can cut them however you’d like to eat them. Just don’t make them too thick or they will not cook properly in the oil. Set aside until you’re ready to cook them (you can see how I’ve sliced my chicken and vegetables in the photos).
Take your sourdough discard, add it to a bowl along with the baking powder and a little of the seltzer water. Use a fork or whisk to thin the discard out until it’s like a thin pancake batter. You don’t want it too thick. Remember it’s better to add it little by little to ensure you don’t add too much water.

Heat the oil you’re going to use for frying (you want it between 350ºF and 375ºF or 176ºC and 190ºC). The temperature of the oil is really important for the best result. Too cool and the batter will be greasy, too hot and it will burn.
When you’re ready to fry your meat or vegetables, lightly dust each piece in all purpose flour so they are lightly coated and then dip them into the batter. I do it in batches, so I do a quarter of the pieces of food into the flour and then throw them into the batter. If you do not have vegetable oil you can fry in canola oil, rice bran oil, peanut oil or grapeseed oil. You want a light flavored oil that won’t add too much flavor to the food you’re frying. Do not over batter the pieces or you risk making them soggy.

Very carefully transfer the vegetables or meat pieces from the batter and into the hot oil. Use a scoop to ensure that they are frying evenly and turn them after a minute. They will rise to the top and then go a golden brown. They take around 3 – 5 minutes to cook, depending on the type of oil you’re using and the temp you’re frying at.

Remove the meat or vegetables from the hot oil once they’re golden brown using a metal scoop. Pop them on some paper towel to drain before serving. Sprinkle with salt if desired.

If you love using sourdough discard to create new culinary delights, you might also enjoy these sourdough onion rings, sourdough chicken pot pie or these sourdough banana fritters.


Sourdough Batter [for fish, chicken & vegetables]
Equipment
- Large Pot of Oil or Deep Fryer (I use my Dutch Oven)
Ingredients
- 100 g Sourdough Starter, can be discard
- 50 g Seltzer Water, carbonated water or soda water (see notes)
- 6 g Baking Powder
- 100 g All Purpose Flour, for dusting
For Frying
- 2 L Vegetable Oil, for frying
- 20 g Salt, for sprinkling
Instructions
- Slice your meat or vegetables into small pieces – you can cut them however you'd like to eat them. Just don't make them too thick or they will not cook properly in the oil. Set aside until you're ready to cook them (you can see how I've sliced my chicken and vegetables in the photos).
- Take your sourdough discard, add it to a bowl along with the baking powder and a little of the seltzer water. Use a fork or whisk to thin the discard out until it's like a thin pancake batter. You don't want it too thick.
- Heat the oil you're going to use for frying (you want it between 350ºF and 375ºF or 176ºC and 190ºC) – see notes in post above for options on pans and oils.
- When you're ready to fry your meat or vegetables, lightly dust each piece in all purpose flour so they are lightly coated and then dip them into the batter.I do it in batches, so I do a quarter of the pieces of food into the flour and then throw them into the batter.
- Very carefully transfer the vegetables or meat pieces from the batter and into the hot oil.
- Use a scoop to ensure that they are frying evenly and turn them after a minute. They will rise to the top and then go a golden brown. They take around 3 – 5 minutes to cook, depending on the type of oil you're using and the temp you're frying at.
- Remove the meat or vegetables from the hot oil once they're golden brown using a metal scoop. Pop them on some paper towel to drain before serving.
- Sprinkle with salt if desired (the salt in the photos is just a little sea salt blended with a teaspoon of paprika and dried parsley – super yum).
Notes
Nutrition
Nutrition information is automatically calculated, so should only be used as an approximation.
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Thanks you for all your great information, Insight and sharing all your knowledge.
I have a question, is there a way to make the zucchini in the air fryer instead of frying them?
I found this idea on a different website but thought it was brilliant…That one used just discard and baking soda, which did make for a thick coating but I like it that way (I did end up thinning it after a while to stretch it, with just a bit with milk which is what my normal tempura batter recipe uses). I used up 3 CUPS of discard (yeah, it had been taking over my fridge) frying up 20oz of shrimp and a few green tomatoes. One thing I noticed was that the coating tasted kind of sweet. Could the starch have been digested to the extent that it had broken down into individual sugar molecules?
We did this sourdough discard batter with 5 lbs. of cod, fantastic. I also did use a light beer in lieu of the seltzer water, family said it was the best they have tasted, light yet crispy, without overpowering due to oil retention.
That sounds amazing!! So glad you loved it! xo
this is fantastic .
i actually added milk instead fo water and it was superb.:) thanks for the ideas for discard .
Can you use an air fryer without oil for the same affect ?
No, this recipe needs to be fried 🙂 The air fryer won’t fry the batter like oil will.
This was by far the best batter I have ever made for fish. I usually use beer, but I wanted to see if I would get more sourdough taste with bubbly water. I also added more seasonings (Old Bay, garlic powder, a little Cajun seasoning). It was incredibly crunchy and stayed that way.
I wish I could post a photo of the result. Amazing. Thank you very much.
Omg this is so easy and so delicious! Used beer instead of seltzer.
This batter was fabulous! I made the recipe using discard as written with soda water and cooked thin strips of bronzie in it and made fish tacos!
It was so easy and very delicious 😋 I will certainly be doing this again!
Great recipe Kate, thank you! 😁🐟
Can this recipe be used in an air fryer?
This recipe won’t work in an air fryer. It needs to be fried. 🙂
we cant fry food. coiuld we bake at 425 F and spray on olive oil
I don’t think that will work. This recipe should really be fried to cook the batter.
Hi I wanted to try this recipe as it was vegan. It seemed like I ran out of sourdough mixture rather quickly for my zucchini, and I only did 2 small to medium squash. Since the squash is wet, I dried it out previously before the flour step. Seemed like the flour on the zucchini caused my batter to thick a bit which I think led to me running short. Also, that flour step needs seasoning.