Pumpkin & Butter Beans Burger

Ingredients

• 350 g pumpkin
• 1 can of butter beans
• 30 g wholegrain breadcrumbs
• 20 g pistachios
• 1 tbsp chopped chives
• ½ tsp ground black pepper
• 1 egg white
• grated zest of 1 lemon
• 3 tbsp olive oil
• 10 bread rolls, split and spread with butter
• 50 ml chilli sauce
• baby spinach leaves
• 1 large onion