Prep the steak by slicing into thin strips against the grain.
Slice the shishito peppers, discarding the top stems and mince the garlic cloves.
In a large skillet, heat 1 tablespoon oil over medium heat.
Add the steak to the pan and cook until browned. Remove the steak from the pan, and wipe the pan clean.
Add 1 tablespoon oil to the pan. Add the garlic and the shishito peppers. Saute for 1-2 minutes, stirring frequently.
Add the steak back to the pan. Cook everything for 3 minutes.
In a bowl, add the soy sauce, water and brown sugar. Stir to combine. Then pour into the skillet. Cook for an additional five minutes.
Serve over rice, cauliflower rice, or quinoa.