Ingredients
- 1 red onion finely sliced
- ½ tsp sesame oil
- ½ tbsp dark soy sauce
- ½ tbsp butter
- 2 tbsp oyster sauce (see tip)
- 4 field mushrooms peeled, if you like, and stalks removed
- 1 courgette sliced lengthways into 4 slices
- 4 burger buns
- 2 tbsp mayonnaise
- 1 tsp chilli oil (use the chilli flakes from the bottom of the jar for a better flavour)
- 4 lettuce leaves
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