Mediterranean chickpea salad

Ingredients

• 200g new potatoes
• 50g green beans, trimmed
• 85g mixed salad leaves
• 1 x 200g can chickpeas, drained
• Small red onion, thinly sliced
• 1 clove garlic, crushed
• 6 cherry tomatoes, halved
• 4 black olives, halved and pitted
• 20g parmesan shavings
• 2 tablespoons white wine vinegar
• 1 teaspoon olive oil
• Juice of half a lemon
• 1 shallot, finely chopped
• 1 teaspoon Dijon mustard
• Freshly ground black pepper