In a large pan over medium heat, heat the butter until melted.
Add the shrimp, salt, and pepper, then stir. Cook for 5 minutes, stirring occasionally, until the shrimp are cooked through and light pink.
Remove the shrimp from the pan.
In the same pan over medium-high heat, add the sesame oil. Once hot, add the vegetables, tamari, and rice vinegar.
Cook for another 7 – 10 minutes until the vegetables are cooked.
Add the garlic and ginger, then mix well. Add salt to taste if desired.
Add the shrimp back to the pan and stir to combine with the other ingredients.
Garnish with chopped green onions and sesame seeds before serving.