Sweet Potato Nachos

• 2 medium sweet potatoes
• 400 g tin black beans
• 30 g taco seasoning, salt reduced
• 2 tomatoes, diced
• 1 brown onion, diced
• 1 avocado, thinly sliced
• .25 red cabbage, shredded
• .5 cup coriander (cilantro), finely chopped
• .25 pineapple, diced (optional)
• 1 lime, quartered