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My ice cream is great tasting but it gets very hard over time and has a lot of ice crystals. I realize that I have to freeze it faster to reduce the size of the ice crystals but it was suggested to me to use guar gum to help. I tried adding it but it clumped up (like gum not surprisingly, lol) so do I have to put in a little boiling milk to dissolve it or how should I add it next time? The ice cream was a little stringy or syrupy after adding it to the ice cream. Did I add too much? I used a tsp of guar gum for a home size Hamilton Beach ice cream maker. I am allergic to corn so I can't use xanthum gum unless I can find a corn free source. I'm hoping that I can get the guar gum to work.

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related: cooking.stackexchange.com/questions/27545/… –  Jefromi Nov 25 '12 at 17:40
    
Also I doubt speed of freezing is your main problem - usually icy homemade ice cream is just because you have too little fat and sugar in your recipe. Compensating with guar gum should work though, up to a point. So does keeping it in a warmer part of the freezer like the door. –  Jefromi Nov 25 '12 at 17:45

3 Answers 3

I think you're on the right track with the guar gum. It should help with the shelf life, and reduce large ice crystals too. The trick is to add it slowly while spinning the mix in a blender. That keeps it from clumping. Try adding a fourth of a teaspoon at a time, checking to see how thick it's getting. I know from using xanthan gum that you can see an immediate difference each time you stop the machine. Just get it thick enough that you can barely start to see a difference -- if you add too much, it'll start having a real sticky, gloppy, texture, and be somewhat chewy. I don't think it'll take much to make a difference with the problems you're having.

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A teaspoon is too much. Most recipes I have seen make about 750g ice cream base. That's 0.66%, which is definitely in the thickening range. Try adding less than 0.1%, so 0.5 to 0.7 g guar gum for a 750g recipe. If you don't have a precision scale (they are available for about 10 Euros online, so if you use guar gum, dry yeast and similar ingredients often, it is a good investment), make it a small pinch, or the tip of a knife, but be prepared to have large measuring errors.

Against the clumping, just don't throw it into the mixture like that. Gums clump immediately when they touch moisture, much stronger than starch. It is best to first mix thoroughly the powdered gum into a tablespoon of your sugar, then mix this sugar into the whole batch of sugar, and then use the sugar as usual. If you decide to add gum after the mixture is ready, you should do it in the mixer. Put the mixer at a medium speed, put the gum into a spoon, and slowly tip the spoon into the wind caused by the beaters, so that the powder reaches the mass as a flurry of separate particles and is immediately dispersed by the beaters.

Changing to xanthan gum won't help much, as both have the same clumping problems and have to be used in similar concentrations. If you have an easier source for guar, it is not worth looking for xanthan, unless you want to use both at once for the synergy effect. But this gets interesting when you want to thicken with them, you don't need this effect in ice cream.

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Where are people getting the idea that Xanthan gum comes from corn?It does not. It is harvested from bacteria (Xanthomonas campestris).

If you are using a cook-up custard to start with, your custard will thicken but will also get ropy or the term is snotty when you pour a spoonful out as you stir. That is definitely a good way to tell if you are using too much Xanthan gum so you need to cut your amount down. You sometimes see that effect in cheap, fat free salad dressings.

It takes less gum than a starch because a gum holds much, much more water than a starch. Where you might use a tablespoonful of cornstarch, you would only use maybe 1/8 teaspoon of gum and that might be a little too much. Gums go into liquid if they are mixed with other dry ingredients or they have heat treated to dissolve instantly. Those are usually only sold commercially so you would not be able to buy them on the internet.

My husband makes a "to die for" cooked vanilla and chocolate custard and freezes it. But it is as hard as a rock after freezing. I am still working on him to let me modify the formula to give us softer (not soft-serve) ice cream. I have a masters in food science but I am going to have to make a separate batch to prove it to him. To most people, anything other than flour or corn starch to thicken must be a chemical. Hope that helps.

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The question asked about guar gum, not xantham gum. –  SAJ14SAJ May 10 '13 at 22:00
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@SAJ14SAJ The question included the claim that the OP couldn't use xantham gum because of a corn allergy. Explaining that it doesn't actually have anything to do with corn seems pertinent. The rest of the advice applies to guar gum as well as xantham gum, seems like, so I think this is still an answer. –  Jefromi May 11 '13 at 1:02
    
Janet, we do prefer answers to be focused on, well, answering the question; the last paragraph doesn't really address the question, especially since the OP is clearly perfectly happy to use these kinds of ingredients. –  Jefromi May 11 '13 at 1:04
    
Xanthan gum is the distilled bacteria grown on a carbohydrate source, this is often wheat or corn sourced, so those whom are very sensitive or extreme celiac should avoid as it will have slight contamination. The amount of contamination of course will be very small considering how little Xanthan gum is used in the first place –  TFD May 12 '13 at 2:26

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