Black bean burritos

Name: Black bean burritos
Prep time: 20 min
Cook time: 1 h
Total time: 1 h 20 min
Cuisine: Mexican
Ingredients: 300g brown rice; ½ small pack coriander , chopped; juice 1 lime; 1 tsp olive oil; 2 garlic cloves , crushed; 1 tbsp chipotle paste; 2 tbsp ground cumin; 1 tbsp brown sugar; 1 tbsp cider vinegar; 2 x 400g cans black beans , drained and rinsed; 400g can chopped tomato; 2 large tomatoes , chopped; 1 red onion , finely chopped; ½ small pack coriander , chopped; juice 2 limes; 2 avocados , stoned and peeled; large wholemeal tortilla wraps, natural yogurt, lime halves to squeeze over and grated cheddar (optional)