Chop the flesh and rind of the preserved lemon into small chunks using a sharp knife.
Add to a bowl along with chopped herbs and garlic.
Season with salt and red pepper flakes.
Add oil and mix well. Refrigerate for a few hours before serving.
Notes
You can adjust the texture of the gremolata by chopping the preserved lemons into smaller pieces/chunks.
For additional flavor, you can squeeze the juice of half a lemon into the mix. If you whisk this nicely into the Gremolata, you will end up with a nice emulsified sauce.