Mushroom Burger With Avocado Coleslaw
Makes 4 burgers
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4 portobello or large flat mushrooms
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4 tablespoons oil
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3 tablespoons soy sauce
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1.5 tablespoons balsamic vinegar
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4 tablespoons chopped onions
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4 garlic cloves, smashed
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A few grinds of black pepper
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1 onion, peeled and sliced into rings
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2 tablespoons oil
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4 burger buns (try and get them around the same size as your mushrooms)
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4 slices cheese for grilling
For avocado coleslaw
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3 cups finely sliced cabbage
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1/4 cup finely sliced red onion
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3 tablespoons good quality mayonnaise
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1/2 large avocado, cut into small cubes
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2 teaspoons lemon juice
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Salt and pepper for seasoning
Step 1 - Brush any excess dirt from the mushrooms and remove the stalk (you can marinate and grill the stalk and eat it separately). Mix the oil, soy sauce, balsamic, onions, garlic and pepper and spoon over the mushrooms. Marinate the mushrooms with the gills up for between 30-60 minutes.
Step 2 - Meanwhile, make the fried onions. Heat a frypan on medium to high heat and add oil and onions. Turn down the heat to medium and caramelise the onions-you don't have to make them as low and slow as onion jam and the onions here are usually done within about 5 minutes. Reserve for burger.
Step 2 - Preheat the grill and line a baking sheet with foil. Transfer the mushrooms to the baking sheet and grill them for 8-10 minutes gill side up. Halve the buns. Turn over once done and then drain the excess juice away. Top the smooth side with the cheese and grill along with the buns cut side up until the cheese is melted and the buns are toasted. Place the mushroom patty on the toasted bun and top with onions and the top of the bun.
Step 3 - To make the avocado coleslaw (which I make while the mushrooms are grilling for 10 minutes), mix the cabbage and onion in a bowl and toss with hands or tongs until combined. Then add the mayonnaise and toss to evenly distribute. Lastly add the avocado and drizzle the lemon juice to prevent it browning on top of it and then very lightly toss this. Taste for seasoning and add salt and pepper if needed. Serve alongside the burger (or in the burger).