Serve this lemon-herb bread with our Salmon Nicoise Salad.
Preheat oven to 350 degrees. In a small saucepan or microwave-safe bowl, combine butter, lemon zest, tarragon, and salt; heat on stove or in microwave until butter melts.
Without cutting all the way through, slice baguette in 1-inch intervals; brush butter mixture between slices. Wrap in foil; bake until hot, about 15 minutes.