Preparation:

• Peel and chop onion; peel and smash garlic. In a blender or food processor, puree the onion, garlic and sesame seeds with the sugar substitute, allspice, thyme, nutmeg, 3/4 teaspoon of the salt, black pepper, cayenne, oil and vinegar.
• Preheat broiler. Lightly spray a broiler pan or baking sheet with cooking spray.
• Rinse fish; pat dry with paper towels. Cut into four 6-ounce pieces, if necessary.
• Sprinkle both sides of the fish with the remaining 1/4 teaspoon of salt, and place them on the prepared baking sheet.
• Spread the spice mixture evenly over the fish. Broil fish, about 6 inches from the heat if possible, until well browned and just done, about 5 minutes for 3/4-inch thick fillets.