
Slice beef thinly against the grain and marinate with oyster sauce, black pepper, garlic, for 15-20 minutes if you have time.
Whisk together all ingredients to make the dressing and set aside. Adjust to taste.
Prepare all the veggies: wash lettuce, micro greens and bean sprouts. Wash, peel and julienne carrot and cucumber. Prepare all the herbs.
Place noodles in serving bowls and top with veggies and herbs.
Place a pan over medium heat. When the pan is hot, add oil. Once the oil is hot, Add lemongrass and stir-fry for 30-40 seconds until lemongrass is fragrant and reduces in volume.
Increase the heat slightly and add beef to the pan in one single layer and let it cook undisturbed for 20-30 seconds. Add fish sauce and stir-fry until just cooked through. Taste and add more seasonings if needed. Work in small batches if needed to avoid crowding the pan.
Place the cooked beef over noodles and top with fried shallots and roasted peanuts. Drizzle dressing and serve. It is often good to start with a small amount of dressing and taste to see if you want to add more.