When I make ginger truffles, I hand grate 1-pound of fresh ginger (if using a food processor, you will need about 1-1/4 to 1-1/2 pounds to allow for waste) and then take the pulp in my hand and squeeze the hell out of it to extract every last drop of juice from it. Depending on the freshness of the ginger, I usually end up with *about* 1/2 cup of ginger juice. If I have more than 1/2 cup of ginger juice, I subtract that excess amount from the amount of cream that I would have normally used. I add all of the ginger juice that I get into my ganache mixture. Mind you, my truffle recipe is, starting out, much more runny than most. However, I like my flavorings to be very pronounced (which probably has something to do with the fact that I've managed to burn off most of my taste buds through too much hot pepper). Even with all of this extra liquid, though, after the ganache sets, it sets well. As for other flavors, if you don't want to go into liquid or oil extracts (many of which, as you know, are completely natural), then what I've found works is to use approximately 5 times the amount of fresh herbs that you would think would be appropriate (this includes Earl Grey tea), and let it steep for several hours, or overnight. I've never done a cold infusion--only hot infusions using the cream. Also, finely chop or muddle your herbs before throwing them into the cream. Hope this helps.