Anna's BBQ steak with creamy caramelised onions and mushrooms

Beef porterhouse steak, raw

800 g

Red wine vinegar

¼ cup(s), (60ml)

Olive oil

1 tbs

Garlic

2 clove(s), finely grated

Dried oregano

1 tsp

Dried herbs

1 tsp, mixed variety

Smoked paprika

¼ tsp, or sweet variety

Olive oil

1 tsp

Brown onion

2 large, sliced

Mushrooms

375 g, sliced

Garlic

1 clove(s), finely grated

Fresh thyme

1 tbs, leaves

Balsamic vinegar

1 tbs

Worcestershire sauce

1 tbs

Light cream

¼ cup(s), (cooking cream), (60ml)