Preparation time: approx. 40 minutes Ingredients: slices of roast beef with fat edge, in approx. 2-3 cm thick slices 4 onions 800 ml beef stock 200 ml red wine 100 g butter 1 tsp brown sugar 1 tablespoon flour 1-2 tbsp balsamic vinegar salt & pepper Preparation: Bring meat to room temperature and preheat oven …
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