Thai beef and corn salad

Ingredients

• 1 tablespoon vegetable or sesame oil
• 1 1/2 cup frozen corn kernels, thawed
• 450 grams beef rump steak, fat trimmed
• 1 lebanese cucumber, thinly sliced
• 1 small red capsicum, cut into thin strips
• 1 cup bean sprouts, rinsed
• 1 fresh long red chilli, thinly sliced
• 1/3 cup coriander leaves
• 1 small red onion, halved, thinly sliced
• 60 grams mixed lettuce leaves
• 1/4 cup lemon or lime juice
• 2 teaspoons fish sauce
• 1 clove garlic, crushed
• lime or lemon wedges, to serve