Korean Beef & Sangchu-geotjeori

Ingredients

• 450g beef strips
• 2 tbsp soy sauce
• 2 tbsp brown sugar
• 2 tsp vegetable oil
• 1 tsp sesame oil
• 1 tsp pepper
• 1 tsp fresh ginger, grated
• 1 garlic clove, minced
• 1 tsp cornflour
• 1 large bunch of green or red leaf lettuce
• 2 garlic cloves, minced
• 1 spring onion, chopped
• ½ small brown onion, thinly sliced
• 1 tsp fish sauce
• 1 tsp sugar
• 1 tbsp white vinegar
• 2 tbsp gochugaru (hot pepper flakes)
• 1 tbsp sesame oil
• 1 tbsp sesame seeds