I am currently outside of the United States and I haven't been able to find granulated sugar, all I've been able to find is what seems to be raw sugar and powdered sugar. Would either of these work to make chocolate chip/sugar cookies?
Cookies – use raw sugar to make cookies instead of granulated
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You can replace the granulated sugar with confectioner's sugar, but due to that starch, you'll end up with an icing-like consistency. In fact, royal icing is just egg whites and confectioner's sugar.
There is actually a surprisingly large number of variables when it comes to beating egg whites, with the amount and type of sugar being just one of them. I'm not sure if this is going to be a complete list, but here's the basics of what you need to know for beating up to the "stiff peak" stage (and if you want soft peaks, then just don't beat for as long):
Age of eggs. Older eggs will whip faster and to a greater volume, but will be less stable (i.e. will deflate faster). Most people seem to find they get the best results with eggs that are about 3 days old. Very fresh eggs are difficult to whip, and very old eggs (more than 1-2 weeks) are just too unstable to work with.
Temperature. You want to separate the eggs when cold, because the whites are firmer and it will be easier for you to cleanly separate the yolks from the whites. But you always want to allow the whites themselves to come up to room temperature before you start beating them, for the exact opposite reason - the proteins are less firm, more stretchy, and will more readily accept air.
Impurities (especially fat). Make sure you don't have any impurities. Use a clean, dry mixing bowl and whisk. Don't let any of the yolk get in; even a trace amount will significantly decrease the amount of air you can incorporate, and if you happen to contaminate the whites this way, it's probably better just to start over.
Salt and acid both help egg whites to coagulate, which you might remember if you've ever had to poach them. That has a stabilizing effect which will allow you to whip the eggs longer and firmer without blowing a hole in the web of proteins, and will also help to prevent (or at least slow down) the foam/meringue from deflating afterward. You don't need more than a pinch of salt, and the traditional amount of acid is either 1/8 tsp cream of tartar (preferred) or 1/4 tsp lemon juice or vinegar. You'll want to start adding these early, as soon as you see the egg whites starting to foam.
Finally, sugar is critical to attain the stiffest peaks, but it is critical that you do not add it too early or too quickly! Sugar serves a similar role here as it does in baking; it dissolves in the water, absorbing it and drawing it away from the proteins, which improves stability a lot. But this particular type of stabilization is a double-edged sword; if you add it too early, it will interfere with the coagulation process and it will take forever to beat them to peaks. And if you dump in all the sugar at once, it will just deflate the foam you've worked so hard to produce (and possibly break it, requiring you to start all over again with new eggs).
In general, you want to add the sugar right after you see soft peaks beginning to form, and incorporate it very gradually while beating. If you want the final result to be soft peaks instead of stiff peaks (which you do, in this case), you can add the sugar slightly early, but err on the side of caution here. Stiffer peaks won't harm your pudding that much, but no peaks definitely will. I also suggest using superfine sugar, because the finer the granules, the quicker they will dissolve; but don't use icing sugar unless you want icing.
Finally, don't over-beat the whites. As I alluded to above in the salt/acid section, the beating process involves stretching the proteins and incorporating air; incorporate too much air and you'll just break the proteins, and then you'll have to throw the eggs out and start all over again. This is especially easy to do accidentally if you use cold eggs.
If you keep all of these things in mind then you can whip the eggs all the way to a nice stiff meringue; soft peaks should be a piece of cake.
Speaking from making fudge, I have gotten the most consistent results using superfine / castor sugar.
- I haven't noticed starch related issues from powdered sugar, but your mileage may vary; the problem I have had with it is due to clumping in spite of the starch (particularly in a frosting recently).
- I have used granulated sugar to make fudge and it is grainy. I melted most of it, but got sick of stirring it as it got crazy thick. I suppose it's possible to get it to the point of a completely dissolved syrup, but that would take longer than it is worth since you are likely going to run the risk of scorching.
Relative to the taste and structure, you won't get anything special from the caster sugar. However, you will get a more predictable product, and less hassle waiting for it to dissolve. You will also avoid texture problems and reduce the risks brought on by extended time in the pot (i.e. too much heat, likelier to accumulate moisture randomly).
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Best Answer
Granulated sugar is 100% sucrose with the molasses removed. Raw sugar on the other hand is refined sucrose with its natural molasses. The answer is yes, you can use them but you might need a bit of tweaking within the recipe. If your raw sugar looks a bit more like brown sugar then your chocolate chip cookies would come out more chewy (not that its a bad thing) because of the molasses in them, whereas granulated sugar would yield a crumb that is more crisp.
P.S. Its alright to use powdered sugar. Some recipes even call for it when baking cookies. However, when substituting granulated sugar to powdered sugar, i recommend that you use a scale since powdered sugar holds so much air when packing into a cup measurement. Measure 7 oz of powdered sugar per 1 cup of granulated sugar.