Flank steak, caramelized onion, mushroom and blue cheese panini

Steaks Spanish cuisine
flank steak, caramelized onion, mushroom and blue cheese panini

I was in the mood for a panini sandwich for dinner. I decided to marinate some flank steak in a balsamic, Dijon and garlic marinade. Looking through my refrigerator and pantry I found an onion,

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k st flan steak

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