A bed of fragrant fresh thyme lends wonderful flavor to the fish. Have your fishmonger remove the pin bones from the fillet, and choose one cut toward the head end of the fish.
Preheat oven to 450°.
Line a baking sheet with parchment paper. Arrange thyme sprigs in a long row on parchment. Place salmon, skin side down, on top of thyme.
Combine mustard, honey, and vinegar in a bowl. Brush mixture evenly over top of salmon. Sprinkle salmon with 2 teaspoons thyme leaves, salt, and pepper. Arrange lemon slices over salmon.
Bake salmon at 450° in center of oven 26 minutes or until desired degree of doneness. Serve hot or at room temperature.
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