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I just found out they make fancy devices for pressing garlic. However, I'm unsure of when I should use this. When do chefs press garlic and when do they chop it? Is there a rule of thumb that needs to be followed? Also, why does only Garlic and Ginger get pressed?

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I'd say for home cooking, nobody you'll ever serve the food to including yourself will tell the difference between crushed and "finely minced", you'll just save yourself a significant amount of time if your knife skills aren't at a pro chef level. –  millimoose Dec 16 '13 at 23:10
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2 Answers

That is actually quite controversial in its own way. If you are going to use a garlic press, you should cut the root end off the clove (you can do that a bulb at a time if desired) and give the individual cloves a bit of a crush with the side of a big knife before you press them. If you do that and you have a good garlic press, you can then just pluck the paper from the press to be ready for the next clove. That's fine, if pressed garlic is actually what you want.

Garlic is funny this way. It all depends upon how fussy you want to be. Pressing is about the least "perfect" way to prepare garlic for anything, but it pretty much works for everything. Many people find pressing to be the most convenient way to deal with garlic. If you press garlic you get fresh garlic juice and smudged garlic paste. For almost anything that is adequate.

If you desire for more than adequate, the kind of superlative awesomeness that Michelin Star judges look for and your little brother would never notice, then you need to break out the knife skills. Slicing, mincing, smearing, crushing, and even pressing give different results, even if those differences are barely apparent to us mere mortals.

I don't think ginger should ever be pressed, and I would not say that pressing is an always adequate technique like I would say for garlic. The best methods for ginger are to grate with a microplane or a ginger grater, to finely dice, to do it in volume with a food processor and then keep in the fridge or freeze in single use aliquots, or to roast and use in big chunks. You might find it helpful to know that you can freeze the whole hand of ginger. Frozen, you can use a microplane and the paper will just drift out of your way.

I'm not aware of anything else for which a press of the garlic press type could be of any use.

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I do press ginger sometimes for convenience, but due to the fibrous texture what you get is more like ginger juice. –  sourd'oh Dec 6 '13 at 18:07
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@sourd'oh Have you ever microplaned it frozen? It's pretty nifty. –  Jolenealaska Dec 6 '13 at 21:03
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There are three factors to consider in deciding whether to chop or mince garlic versus using a garlic press:

  1. Texture. If you want a sauce or dressing to be completely smooth, the texture of pressed garlic is suitable as it is essentially pureed.
  2. Flavor. As a general rule of thumb, within limits, the more finely you chop garlic, the more strongly its flavor will permeate a dish. Crushing or using a press maximizes this.
  3. Convenience. For a small number of cloves, a garlic press can be used without peeling the gloves. Of course, the press must then be cleaned, but some people find that easier than manually peeling.

In practice, professionals almost never use an actual garlic press because:

  • They know the tricks to efficiently peel small or large quantities of garlic.
  • For small quantities, with good knife skills, a press isn't necessary to get pureed garlic. It is fast and simple to get pureed garlic with nothing but a knife by smashing a clove or two with the flat of the blade, then mincing with salt, and smearing with the flat of the blade. This method does not require stopping occasionally to clean out the press.
  • If larger quantities are required, a food processor will chop the garlic as finely as desired.
  • Garlic in various forms can be purchased ready to use, from whole peeled cloves, to chopped, to pureed. Depending on the type of professional kitchen, and the results desired, one of these convenience products may be used to make things easier.

Garlic presses are convenient mostly for home cooks doing small quantities, who like the pureed quality of garlic it creates, or who hate peeling garlic. There is no circumstance in which they are essential.

As to other herbs suitable for a press, garlic is unique in its size and texture, making it uniquely suitable to a press.

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Slight niggle on flavour. If you chop garlic, you will cut through cells, releasing more flavour. If you crush, you will leave more cells intact, resulting in a milder flavour. –  slim Dec 5 '13 at 12:01
    
@slim: I'm sure its the opposite, actually. Crushing produces a soggy mass and all the cells are ruptured, whereas cutting leaves more cells intact. I can't speak to whether the flavour is milder if crushed, but certainly all cells will be ruptured. –  bamboo Dec 6 '13 at 12:26
    
@bamboo "Crushing" as a culinary term regarding garlic can mean every thing from barely breaking up the clove with the side of the knife to creating a puree. It kind of depends upon who you're talking to. –  Jolenealaska Dec 9 '13 at 8:26
    
@Jolenealaska. Crikey, nothing's easy is it - I use my garlic crusher when I want to crush it and its almost puree, so I assumed other garlic crushers would do the same job. When I 'crush' with a knife blade, I call that 'squashed' rather than crushed and usually slice/chop it after ten minutes, long enough for the chemical changes to take place. Guess it's all down to the language... –  bamboo Dec 9 '13 at 12:19
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