Chicken and bean burritos

Name: Chicken and bean burritos
Ingredients: 1 (90g) medium piece lime; 1/4 (40g) medium red onion, chopped finely; 1 fresh long green chilli, chopped finely; 1/2 (75g) medium tomato, chopped coarsely; 1/2 cup fresh coriander leaves, lightly packed, chopped coarsely; 1/2 cup (100g) rinsed, drained canned, red kidney beans; 1/2 cup (60g) cheddar, coarsely grated; 1 cup (150g) cooked white long-grain rice (see notes); 1 medium ripe avocado (250g); 4 x 22cm burrito tortillas; 1 1/2 cup (240g) shredded barbecued chicken; freshly ground black pepper and salt, to season