Prepare the fresh udon noodles according to the package instructions, then drain and set aside.
In a small bowl, whisk together the tamari, toasted sesame oil, rice vinegar, honey, and red pepper flakes to create the stir-fry sauce.
Heat the avocado oil in a large skillet or wok over medium-high heat.
Add the shrimp to the skillet and cook for 2-3 minutes until they are pink and opaque, then remove them from the pan and set aside.
In the same skillet, add the minced garlic, grated ginger, sliced red bell pepper, and chopped baby bok choy.
Sauté the vegetables for 3-4 minutes until they are tender-crisp.
Add the cooked udon noodles and the shrimp back into the skillet.
Pour the sauce over the mixture and toss everything together for 1-2 minutes until the noodles are well-coated and heated through.
Garnish with sliced green onions and serve immediately.