Place pan on stove top.
Wrap fish in cheesecloth and place in pan.
Add enough water (and some white wine if you wish) to cover fish completely.
Sprinkle some of the above spices and herbs into the poaching liquid.
On medium to high heat, bring to a simmer.
Reduce heat, cover and gently simmer 8 to 10 minutes for each inch of thickness of fish.
Lift fish out of pan and place on platter, unwrapping the cheesecloth.
Peel off skin and remove fins if desired.
To serve, cut to bone and slide spatula to lift off serving.
Serve hot or cold with horseradish sauce, or mustard dill. Capers optional.