Order up! Burger night just got a whole lot healthier

Ingredients

• 2 tbsp extra virgin olive oil
• 1 small red onion, finely chopped
• 2 garlic cloves, minced
• ¼ cup firmly packed chopped flat-leaf parsley leaves and stems
• 1 small beetroot, grated
• 125 g tinned black beans, drained, rinsed
• 2 tbsp dried breadcrumbs
• 1 tbsp ground flaxseed
• 4 seeded rolls
• 4 slices vegetarian cheddar
• 12 slices pickles
• 60 g baby spinach leaves
• 1 carrot, shaved lengthways
• ⅓ cup mustard
• 1 kg orange sweet potatoes
• vegetable oil, for deep-frying