Mushroom chickpea burgers

Name: Mushroom & chickpea burgers
Ingredients: 1 tbsp olive oil; 250g chestnut mushroom, finely chopped; 2 garlic cloves, crushed; 1 bunch spring onions, sliced; 1 tbsp medium curry powder; zest and juice ½ lemon; 400g can chickpea, rinsed and drained; 85g fresh wholemeal breadcrumb; 6 tbsp 0% Greek yogurt; pinch ground cumin; 2 mixed-grain muffins or rolls, toasted and halved; 2 plum tomatoes, sliced; handful rocket leaves