In a large mixing bowl, combine all items for the beef: ribeye cut, onion, soy sauce, oyster sauce, sugar, MSG, sesame oil, and minced garlic. Cover and allow to marinate overnight.
To make the dressing, boil ⅓ cup of water. In a mixing bowl, add the ⅓ cup sugar. Then pour the boiling water to help dissolve the sugar. Then add ⅓ cup fish sauce, ⅔ cup cold water, 6 thai peppers minced, ½ lime juiced, and ½ head garlic minced. Set aside until ready to serve.
In a large wok, heat 2 tablespoon oil over medium-high heat. When the oil is smoking, add white onion and cook for 1 min. Add your beef and cook until medium-rare (or to your preferred doneness) - 2 or 3 minutes. Turn off the heat.
Assemble your noodle bowl with veggies and lettuce first, then vermicelli noodles, meat, cucumber, fish sauce dressing, and crushed peanuts.
