Put diced ginger in a saucepan and cover with water.
Bring to a boil and simmer for 15 minutes.
Drain and repeat two times.
Drain thoroughly and puree ginger in a blender until smooth and paste like; set aside.
Combine wine and shallots in a heavy saucepan and bring to a boil.
Simmer until only 1/2-cup wine remains.
Add corn oil, a little at a time, stirring constantly.
Add salt, mix well, and cover to keep warm.
Remove skin from salmon and remove any little vertical bones with tweezers; cut into 4 equal portions.
Spread a thin layer of the ginger puree on top of each portion and sprinkle evenly with cracked peppercorns.
Heat oil in a skillet large enough for all 4 portions of salmon.
When skillet is very hot, saute the salmon, ginger-side down, for 2 minutes.
Turn fish and sear other side just to seal; do not overcook.
Remove fish from pan and place on paper towel, ginger-side up.
To serve, spoon 2 tbsp of the red wine sauce on each of four plates and top with the salmon.
Ready in 30 min.