Grilled chicken tacos

Ingredients

• 200 g black beans, tin, rinsed and well drained
• 200 g red beans, tin, rinsed and well drained
• 2 tomatoes, peeled, deseeded and finely diced
• 1 - 2 chilli peppers, finely chopped
• 1 onion, diced
• 2 tbsp freshly chopped coriander
• 4 - 5 tbsp olive oil
• Sugar
• 1 - 2 tsp lime juice
• 4 chicken breast fillets, approx. 120 g each
• 2 tsp tandoori spice mix
• 8 - 12 small tortillas
• 2 spring onions, sliced on the diagonal
• 1 avocado, cut into narrow wedges
• 1 handful coriander, leaves picked
• 100 g sour cream