Make a dredge of approximately 1/2 cup flour mixed with 2 teaspoons of black pepper, in a large ziploc bag.
Take the rabbit out of the marinade and pat dry. (Don't throw away the marinade!)
Dredge each piece and knockoff excess flour.
Strain the marinade into a bowl or large measuring cup.
In a large dutch oven, melt down the bacon fat.
Brown the rabbit pieces in batches, removing and setting aside.
Add onion to pot and cook until soft and just turning golden brown.
Return the browned rabbit to the pot.
Add the strained stock/marinade and bring to a light simmer.
Put lid on the pot and bake for a 2-3 hours at 325F.
Remove the rabbit from the pot.
Add the sour cream to the pot and whisk to mix.
Serve rabbit with gravy!