Put the flour and grated almonds in a bowl. Separate the eggs. Add the milk to the flour and stir everything well, then gradually stir in the egg yolks. Season with salt and pepper.
Beat the egg white until stiff and fold in carefully.
Cut the chorizo into approx. 1 cm thick slices and place them in a buttered baking dish. Pour the Clafoutis batter over it and sprinkle with Gruyère.
Bake in the oven preheated to 180 degrees for about 30 minutes.