Thinly slice the flank steak against the grain into bite-sized strips.
In a small bowl, whisk together tamari, honey, grated ginger, and minced garlic to create the stir-fry sauce.
Heat sesame oil in a large skillet or wok over medium-high heat until shimmering.
Add the beef strips to the pan, seasoning with sea salt and black pepper, and sear until browned, about 3-4 minutes.
Remove the beef from the pan and set aside; add broccoli, bell peppers, and snap peas to the same pan.
Stir-fry the vegetables for 4-5 minutes until they are bright and slightly tender.
Return the beef to the skillet and pour the sauce over the mixture, tossing to coat everything evenly.
In a separate small pan, lightly sauté the cauliflower rice for 2-3 minutes until heated through.
Serve the beef and vegetable mixture over the cauliflower rice and garnish with sesame seeds.