1. Cook pasta. Drain and set aside for later use.
2. Heat a little oil in the pan. Fry beef slices first till no more pinkish.
3. Add in a little chopped garlic. Stir fry till aromatic.
4. Add in 1 1/2 tsp oyster sauce. Pour in 1/4 cup hot water. Simmer a bit to reduce the sauce.
5. Add in spinach. Stir fry for 2 mins. Sprinkle a little white sesame.
6. Add pasta back into pan. Season with salt and black pepper. Mix well.