Mushroom & chickpea burgers

INGREDIENTS

• 1 tbsp olive oil
• 250g chestnut mushrooms , finely chopped
• 2 garlic cloves , crushed
• 1 bunch spring onions , sliced
• 1 tbsp medium curry powder
• zest and juice ½ lemon
• 400g can chickpeas , rinsed and drained
• 85g fresh wholemeal breadcrumbs
• 6 tbsp 0% Greek yogurt
• pinch ground cumin
• 2 mixed-grain muffins or rolls, toasted and halved
• 2 plum tomatoes , sliced
• handful rocket leaves