Prepare the rice noodles according to package instructions by soaking them in hot water until tender, then drain and set aside.
Heat a large skillet over medium-high heat and add the ground beef, breaking it apart with a spatula.
Season the beef with sea salt and black pepper, cooking until browned and fully cooked through, then remove the beef from the skillet and set aside.
In the same skillet, add the sesame oil followed by the diced yellow onion, sliced zucchini, and red bell pepper.
Sauté the vegetables for 4-5 minutes until they are tender-prime but still retain a slight crunch.
Stir in the minced garlic and grated fresh ginger, cooking for 1 minute until fragrant.
Return the cooked beef and the prepared rice noodles to the skillet.
Pour the tamari over the mixture and toss everything together for 2 minutes to ensure the noodles are coated and heated through.
Garnish with sliced green onions before serving warm.