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How can I maximize ginger extraction?

I want to make ginger drinks (bourbon, hot tea, ginger ale). In all cases, I want to create a ginger syrup that I can then add to bourbon, hot water, soda water to get my desired drink. I have tried the following methods:

  • Slice ginger thinly, put in boiling water for 1 hour
  • Chop ginger very finely, bring water to boil, cover, steep one hour
  • Chop ginger very finely, bring water to simmer for one hour
  • Puree ginger and small amount of water in vita mix

In all cases, I've found that I need to remove the leftover ginger, as it would just settle out of a drink. I've tried it with varying amounts of sugar (from none to 1:2 sugar:water). What I'm left with is a pretty good product, but the ginger has a lot of flavor left in it. In fact, I can use it again with the same process and still get a good result.

I would like to get a very strong product with minimal life left in the ginger, so that I can minimize the amount of ginger I use. I'd also like the syrup / extract to be as strong as possible to minimize the amount I add to my drink. To top it off, I would prefer the process not be to laborious or time consuming.

How can I maximize the extraction of ginger flavor in to a liquid?