Make a change from meat with these marvellous mushroom burgers. The sweetness of the onion and courgette goes beautifully with the savoury oyster sauce
Prep:10 mins
1 red onion, finely sliced½ tsp sesame oil½ tbsp dark soy sauce½ tbsp butter2 tbsp oyster sauce (see tip)4 field mushrooms, peeled, if you like, and stalks removed1 courgette, sliced lengthways into 4 slices4 burger buns2 tbsp mayonnaise1 tsp chilli oil (use the chilli flakes from the bottom of the jar for a better flavour)4 lettuce leaves
STEP 1Stir-fry the red onions in the sesame oil until tender and cooked through, about 8 mins. Set aside and keep warm.STEP 2Meanwhile, put the dark soy sauce and butter in a pan and melt together, then add the oyster sauce and stir. Brush the mixture over the mushrooms, then leave for a minute so the mushrooms can absorb the sauce. Heat the grill to high.STEP 3Grill the mushrooms until tender, about 10 mins. When ready, you should be able to slip a knife through the thickest parts quite easily.STEP 4Grill the courgette slices until they start to blister, and are brown and tender. Warm the burger buns briefly under the grill, and mix the mayonnaise with the chilli oil.STEP 5Brush the base of each burger bun with some chill mayo, then add a courgette slice, lettuce leaf and mushroom. Top with some stir-fried onions and the bun tops.
