Douglas Ford, sous-chef at LA's Lucques, uses a mortar and pestle a lot for things like grinding spices or garlic. It's often preferable to a mechanical device like a blender or Cuisinart, because the heat those devices create will cause some ingredients to oxidize more quickly and turn brown.
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TRANSCRIPT
At our restaurant at Lacques, we use mortar and pestle for a lot of different things, pounding garlic, grounding spices, pounding herbs. When you're using something mechanical, like a blender, the movement of the blade is so fast that it creates heat and that will oxidize a lot of herbs. By using a mortar and pestle, you're grinding stone to stone, it's not creating the same amount of heat and it'll keep them staying really green instead of oxidizing and turning brown.
![](https://i.ytimg.com/vi/blX981htnIY/mqdefault.jpg)