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Finely chop the spring onion and mushroom in a food processor.
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Add the beef, breadcrumbs, eggs, herbs, tomato puree and seasonings and process for a few more seconds, until the mixture binds together but still retains its texture.
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Dampen your hands to prevent the mixture from sticking and roll into 8-12 portions (depending on how large you like em!).
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Place your balls on a baking sheet lined with baking paper.
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Press the balls to flatten into flat round burgers.
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Let rest in the fridge for 30 minutes or until ready to cook, freeze any extras.
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BBQ the burgers 5-8 minutes each side or cook in a non-stick frying pan for 5-8 minutes each side. Use a fish slice to flip the burgers gently so they don't break up.
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Serve with sliced cheese, salad leaves, sliced tomato, relish of your choice and yummy homemade oven fries.