Healthy beef and mushroom stroganoff

Name: Healthy beef and mushroom stroganoff
Ingredients: 150g/5½oz brown basmati rice; 1 tbsp light olive oil; 4 shallots, finely chopped; 1 tsp sweet smoked paprika; 1 red pepper, seeds removed, roughly chopped; 200g/7oz chestnut mushrooms, thinly sliced; 2 garlic cloves, finely chopped; 1 tbsp cider vinegar; 1 level tbsp wholegrain mustard; 150ml/5fl oz beef stock; 200g/7oz lean sirloin steak, visible fat removed, thinly sliced; 100ml/3½fl oz fat-free plain fromage frais; 2 level tbsp roughly chopped gherkins; 2 tbsp finely snipped fresh chives; salt and freshly ground black pepper