Preheat oven to 450°F.
To make the balsalmic drizzle: in a small saucepan over high heat, bring the vinegar to a boil and reduce to 2 tablespoons; 2-3 minutes. Remove from heat and whisk in mustard, set aside to cool.
Wrap a piece of bacon around each piece of fish, securing it with a wooden toothpick.
Lightly coat a baking sheet with any high-heat cooking oil and preheat the baking sheet.
Once the baking sheet is hot, remove it from the oven and quickly arrange the bacon-wrapped fish. Bake for 10 minutes. Set aside to cool slightly.
Drizzle the balsamic drizzle on a platter, arrange the bacon-wrapped fish on top, and sprinkle lightly with salt and pepper. Serve hot.