Dab the fillet dry and cut into thin slices. Rinse chanterelles briefly, drain well and clean. Cut large mushrooms in half. Clean and wash spring onions and cut into rings. Wash thyme and pluck off leaves.
Fry diced ham in a pan without fat until crisp. Add 1 tablespoon of oil and heat up. Add the chanterelles and fry vigorously while turning. Fry spring onions and thyme briefly. Season with salt and pepper.
Sprinkle everything with vinegar, bring to the boil briefly. Take it out.
Heat 1 tablespoon of oil in the large cast-iron pan. Fry the fillet slices in it in portions over high heat for 10 seconds on each side. Season with salt and pepper. Add mushrooms and mix everything.