In a bowl, combine the flour and beer with a whisk. Whisk in the oil and egg whites. Season with salt and pepper.
Preheat the oil in the deep fryer to high temperature.
Preheat the oven to 100 °C (200 °F). Line a baking sheet with paper towels.
With a brush, coat each blossom with the batter. Fry four blossoms at a time for about 3 minutes or until nicely golden brown. Drain on the paper towel and keep warm in the oven. Sprinkle with fleur de sel before serving.
Recipes with the "Healthy Pick" stamp have been evaluated by a registered dietitian member of the Ordre professionnel des diététistes du Québec.