Banh Mi with Beef (Vietnamese Beef Sandwich)

Ingredients

• 1 each lemongrass stalk, roughly chopped
• 2 tbsp sugar
• 1 tbsp fish sauce
• 1 tsp garlic, minced
• 1 tbsp sesame oil
• 2 tbsp light soy sauce
• 200g beef steak, rump or sirloin
• 2 tbsp vegetable oil
• 1 each 12" baguette, cut in half
• or 2 rolls
• 4 tbsp mayonnaise
• 60g daikon radish and carrot pickle
• 30 rocket salad leaves
• jalapenos, pickled and sliced
• 1 each large fresh red chilli, thinly sliced
• 3-4 sprigs fresh coriander