In a medium bowl, combine soy sauce, oyster sauce, fish sauce, sugar and black pepper. Mix until well combined. Place beef in another medium bowl. Add half the marinade and toss to coat. Marinate ...
Arrange the noodles on a large platter. Sprinkle with the scallions, cilantro, crushed red pepper and the fried shallots and garlic. Arrange the shrimp on top and serve with lime wedges alongside.
If mixture looks too tight, loosen with splashes of hot water. Season with salt to taste. To serve, ladle upma into bowls and garnish with dollops of yogurt, chopped cilantro and lime juice.