Combine steak, garlic, and red pepper flakes in a bowl; toss well to coat. In small bowl combine soy sauce, corn starch, and sugar, stirring with whisk until smooth.
Heat sesame oil in a large skillet over medium high heat. Add sugar snap peas to pan and stir-fry for 1 minute. Add seasoned meat to pan and stir-fry for 2 minutes. Add soy sauce mixture to pan and stir-fry 1 minute until sauce begins to thicken.
Serve over brown rice or in a leaf of lettuce for a lettuce wrap.
