Beef: Prepare the beef by slicing against the grain in 0.5cm slices. Add to a bowl and cover with 1 tbs oyster sauce, 1 tbs fish sauce, 1 tbs sugar, 1 tsp canola oil, and 1 tsp crushed garlic. Mix well and set aside.
Vegetables: Finely slice ⅓ cucumber and 1 carrot. Wash the mint leaves. Shred ½ lettuce.
Sauce: Add ½ cup hot water to a bowl, add ⅓ cup sugar, ½ cup fish sauce, juice of 1 lime and mix well. Set aside.
Noodles: Cook the noodles as per packet instructions.
Cook beef: Heat a large pan to high heat. Add 2 tbs butter and cook the beef for 3-4 minutes. Remove and set aside.
Assemble: Add a handful of noodles to a bowl. Add beef, lettuce, carrot, cucumber, mint leaves, crushed peanuts and crispy shallots. Drizzle over with the sauce, toss ingredients together and enjoy.