Beef nachos with homemade kūmara chips

Ingredients

• 1 large orange kūmara
• 2 1/2 tbsp extra virgin olive oil
• 1 tsp smoked paprika
• 3 small red onions, thinly sliced
• 2 cloves garlic, crushed
• 500 g minced beef
• 1 tbsp Mexican spice mix
• 1/2 cup canned black beans, rinsed
• 400 g canned diced tomatoes
• 125 g cherry tomatoes, halved
• 2 tbsp fresh lime juice
• 1 large avocado, coarsely mashed
• 100 g feta, crumbled
• 1/2 cup loosely packed fresh coriander leaves
• 1 medium lime, cut into wedges