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Ingredients (9)
10 ml | salt |
60 ml | peppercorns — black, crushed |
100 g | butter |
onion — sliced into half rings | |
5 ml | garlic — cloves, crushed |
250 g | portobello mushrooms — sliced in half |
60 ml | vinegar — balsamic |
125 ml | stock — beef |
2 | steaks |
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