Cook ground beef and white part of green onions in a large skillet over medium-high heat until meat is no longer pink and onions are soft and translucent, about 5 minutes. Remove from pan, drain, and set aside.

Add water, ramen noodles, and frozen vegetables to the same skillet. Bring to a boil and cook until noodles are tender, 3 to 5 minutes.

Meanwhile, combine hoisin sauce, soy sauce, Sriracha sauce, brown sugar, cilantro, Chinese five-spice, and ginger in a small bowl; stir until sauce is well combined.

Return meat to the skillet, add sauce, and and stir until heated through, about 2 minutes. Serve topped with green onions and sesame seeds.