Mexican veggie hash

INGREDIENTS

• 280g new or waxy potatoes , cut into cubes
• 2 tbsp butter
• 2 tbsp olive oil
• 1 red chilli , half sliced, half deseeded and finely chopped
• 1 garlic clove , chopped
• 1 tsp Cajun seasoning
• 198g can sweetcorn , drained and rinsed
• 200g black beans (from a can), drained and rinsed well
• 2 eggs
• 1 ripe avocado , chopped
• lime wedges, soured cream and warm tortillas, to serve (optional)