1 tbsp fermented salted black beans (see note)

2 tbsp avocado oil,plus extra to rub

600g eye fillet,at room temperature

60ml (¼ cup) lime juice

2 tbsp mirin

1 small garlic clove,finely chopped

2 cups mixed lettuce leaves

1 green apple,thinly sliced

1 Lebanese cucumber,peeled and sliced

2 small avocados,halved