On 9/24/2019 at 1:57 PM, Tri2Cook said:
The quick and easy answer is no, you can't. The more technical answer is yes, you can. You can't use citric acid as a direct substitute but you can make your own sodium citrate solution from citric acid, baking soda and water and use it as part of the liquid in the recipe.
I followed the instructions in that reddit post a year or so ago because I had the ingredients on hand and didn't want to wait for delivery. It works. I did most of the boiling on the stove, then transferred to a parchment lined baking sheet in the oven and let it finish baking in there (larger surface area). I wasn't sure how the boiling down would work in the pot, whether it would scorch or damage it which explains the oven. I'm not sure if parchment is water proof and could be some chance of a reaction with the aluminum sheet pan and left over citric acid if measurements are right. You end up with crystals and powder.
