Mushroom Lamb Burger | Australian Mushrooms

Ingredients

• 500g lamb mince
• 1 brown onion, grated
• 2 garlic cloves, crushed
• 3 tsp ground cumin
• 1 cup stale breadcrumbs
• 1/4 cup parsley leaves
• 3/4 cup mint leaves, chopped
• 4 flat mushrooms, trimmed
• 3/4 cup greek-style yoghurt
• 2 tbs olive oil
• 4 hamburger buns, split
• Mixed salad leaves, to serve
• 400g can beetroot slices, drained
• Vegetable crisps, to serve