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Serves 4 pers. • Prep: 15 min • Oven: 30 min • Recipe by Recette 7.
4 large onions, sliced into rings, 1 ready-rolled puff pastry, 100g mozzarella cheese, drained and sliced, 2 tbsp mustard « original », 2 eggs, 200 ml crème fraîche, 1tbsp oil, salt, pepper, herbes de Provence
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