Step-by-Step Instructions
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Prepare the batter: Grate the potato. In a mixing bowl, whisk together the egg, milk, flour, salt, and black pepper until smooth.
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Prepare the vegetables: Dice the onion, grate the carrot, and chop the red bell pepper. Wash and halve the cherry tomatoes.
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Sauté the vegetables: Heat the vegetable oil in a pan. Sauté the onions until translucent, then add the carrots and bell pepper. Cook for 5–7 minutes until tender.
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Combine ingredients: Add the grated potatoes to the batter. Stir in the sautéed vegetables, French herbs, and chopped parsley.
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First baking phase: Preheat the oven to 180°C (356°F). Pour the mixture into a baking dish and bake for 30 minutes.
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Add the cheese: Remove from the oven, sprinkle with grated cheddar cheese. Return to the oven and bake for another 15 minutes until the cheese is melted and golden brown.
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Prepare the sauce: While the gratin bakes, mix sour cream, mayonnaise, finely chopped garlic, pickled cucumber, dill, and black pepper together.
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Serve: Let the gratin cool for 5 minutes and serve with the prepared sauce.
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