Marinate the beef with half the fish sauce and lemongrass while you get everything else ready. You can even do this hours ahead or the night before.
500 g beef, 2 Tbsp fish sauce, 3 lemongrass
Dipping sauce
Mix everything together and keep aside. Can be made a day earlier and kept, covered, in the fridge. Will last 2 days in the fridge.
2 Tbsp fish sauce, 2 Tbsp rice vinegar, juice of 1 lime, 1 tsp palm sugar, 1 small clove garlic, 1 red Thai chilli, 1 spring onion
Cook the beef
Heat the oil in a large frying pan over medium high heat and sauté the onions for a minute.
2 Tbsp vegetable oil, 1 large onion
Add the garlic and lemongrass and continue for 30 seconds.
2 cloves garlic
Add the beef strips, turn the heat up and mix thoroughly, stirring vigorously, for 30 seconds.
Add the rest of the fish sauce and continue cooking on high heat for 1 minute for pink in the middle or as done as you prefer.
Add the pepper and water if using, stir, turn heat off.
1 dash white pepper, 2 Tbsp water
Check for seasoning, add salt if necessary. Leave aside while you assemble the salad in individual portions or take it all to the table for diners to help themselves to.
1 pinch salt
Assembly in order
Rice noodle bed
400 g fresh rice noodles or dry equivalent (see above)
Bean sprouts and rest of the fresh stuff on and all around, see picture.
2 handfuls bean sprouts, small handful coriander leaves, shiso leaves, mint leaves, vietnamese coriander, ½ cucumber, 1 carrot, lettuce
Beef
Spring onions
2 spring onions
Peanuts
handful unsalted roasted peanuts
Drizzle some dipping sauce all over
Leave the sauce on the side for actual dipping too.
Notes
For a stronger flavour, marinate the beef for a couple of hours or even the night before.