Add all of the ingredients for the sauce to a small blender and blend to combine. As an alternative, you can whisk all of the ingredients together in a mixing bowl. If you do so, peel and mince the garlic and fresh ginger. Set aside until ready to use.

Heat a large skillet or wok over medium-high heat. Allow the skillet to heat up for a few minutes before adding the sliced steak and onions. Use a wooden spoon or a rubber spatula to spread the beef and onions into a single layer. Cook undisturbed for 2-3 minutes.

Add the chopped broccoli and bell peppers and cook for an additional 3-5 minutes, until softened but still al dente. If at any point the vegetables are cooking too quickly, reduce to medium heat.

While stir frying the beef and vegetables, heat a large pot of water to boiling on the stove top to cook the rice noodles. Cook rice noodles for 6-8 minutes, or follow the time indication on the package instructions. When the noodles have finished cooking drain them into a colander.

Add the cooked noodles, green onions, and sauce to the skillet with the beef and vegetables. Cook, stirring constantly, until much of the sauce has been absorbed. This goes quickly!

Taste the noodles for flavor and add sea salt and black pepper to your personal taste. Serve beef and noodles immediately, and enjoy!