Preheat oven to 300 F.
In a small saucepan combine champagne vinegar, sugar, salt, caraway seeds and water. Simmer over medium heat, stirring until sugar is dissolved. Remove from heat and add garlic. Set aside for 10-15 minutes. After 10-15 minutes add 1/2 of the fennel slices. Let the fennel brine for about 10 minutes.
Line a baking sheet with parchment paper. Place the salmon on the pan and drizzle with olive oil and season with salt and pepper. Roast for 15-18 minutes or until the flesh flakes when poked with a fork.
Meanwhile after the fennel has pickled for 10 minutes, drain the mixture and toss the fennel with 3 tablespoons of olive oil and 1 tablespoon lemon juice. Add remaining fennel slices, dill and season with salt & pepper.
Serve fennel slaw on top of roasted salmon.