Preparation

• Prepare the crêpe batter:
  In a medium bowl, combine the flour, salt, eggs and milk. Whisk the ingredients until smooth. Let the batter rest 30 minutes at room temperature.
  Make the crêpes. Use a 5-inch crêpe pan to make the crêpes. Heat the pan over medium heat. Coat pan with a little melted butter. Pour in 2 tablespoons of batter, tilting the pan to coat the bottom.
  Cook the crêpe until golden brown (check the color by lifting the edges of the crêpe with a metal spatula). Then flip the crêpe with the spatula and cook the other side.
  Transfer to a plate and cover with a sheet of parchment paper or foil. Repeat the same procedure until all crêpe batter is used.
  Stack the crêpes as they are made.
  Cut the salmon into 2-inch-long strips, about 1/4 inch wide.
  Preheat the broiler. Brush a baking serving dish with the tablespoon of melted butter.
  Lay the crêpes on a flat surface. Divide the strips of salmon between the crêpes, forming a line down the center of each.
  Roll the crêpes into cylinders and arrange side by by side seam side down in the dish.
  Season the crème fraiche with salt and pepper to taste and spoon over the crêpes.
  Broil until the top is golden brown, about 5 minutes. Serve immediately.