Savory Toasted Walnuts:
Toss walnut pieces, brown sugar, molasses, 1 tsp. dry mustard, Worcestershire Sauce, and 1/2 tsp. black pepper.
Spread on a sheet pan and back for 15-25 minutes at 350°.
The sugar will melt and glaze the nuts. Let cool and chop.
Marinate the flounder in the molasses, wine, ginger, onion, 1 tsp. dry mustard, and 1/2 tsp. black pepper for 2-4 hours.
Bake at 350° for 10-12 minutes.
Top with Savory Toasted Walnuts.