Mexican Beef Fajitas - Ainsley Harriott

Ingredients

• 450 g (1 lb) rump, sirloin or fillet steak
• 1 red pepper
• 1 green pepper
• 1 small yellow pepper
• 2 large onions
• 150 ml (5 fl oz) soured cream
• 1 cos lettuce heart, finely shredded
• 3 tablespoons sunflower oil
• 8–12 soft flour tortillas
• salt and cayenne pepper
• 1 medium-hot green chilli, deseeded and finely chopped
• 1 small red onion, very finely chopped
• 1 x 200-g (7-oz) can chopped tomatoes
• juice of 1 lime
• 1 x 20-g (3⁄4-oz) packet fresh coriander, chopped