Bean soup with sweetcorn and avocado

Ingredients

• 1 tbsp vegetable oil
• 1 onion, finely chopped
• 2 cloves garlic, finely chopped
• 1 green chilli, finely chopped
• ¼ - ½ tsp ground cumin
• 600 ml vegetable stock
• 200 ml cup tomato passata
• 400 g ripe tomatoes, seeds removed, finely chopped
• 1 tbsp tomato puree
• 1 pinch sugar
• 410 g canned mixed beans, rinsed and drained
• 325 g canned sweetcorn, drained
• 1 lime, juice
• salt
• freshly ground pepper
• soured cream
• 1 - 2 ripe avocados, sliced
• 1 green chillil, sliced
• lime wedges
• red onion
• coriander (cilantro)
• red pepper flakes
• tortilla crisps