Prepare sauces: Prepare two small bowls for the sauces. In each small bowl, whisk together the ingredients for the steak and shrimp sauces. Set aside.
For the steak: To prepare the steak, pat it vigorously with paper towels to remove excess moisture. Sprinkle on all sides with garlic powder, salt and pepper.
In a large wok, non-stick skillet or griddle, add 2 tablespoons of sesame oil. Heat the oil on medium high heat until the oil starts to sizzle, but not smoke.
Add seasoned steak to the hot oil and sear for 2-3 minutes on both sides, until a rich golden-brown crust forms.
Remove the steak to a cutting board and carefully wipe the skillet clean of any moisture that has been released. Slice the steak into bite-sized cubes.
Add the steak sauce to the skillet, and heat on low-medium heat until it begins to simmer.
Add the steak cubes to the sauce, and sauté for about 1 minute to coat the cubed steak.
Remove steak from skillet and allow it to rest in a bowl while you cook the shrimp.
For the shrimp: To prepare the shrimp, pat shrimp with paper towels to remove excess moisture. Sprinkle the shrimp with salt and garlic powder.
Carefully wipe your skillet clean, then add the remaining 2 tablespoons of sesame oil. Heat the oil on medium-high heat until the oil is starting to sizzle, but not smoke.
Add seasoned raw shrimp to the hot oil in a single layer, then sauté for 3-4 minutes until the shrimp is opaque.
Then, add shrimp sauce to the skillet and toss while the shrimp cooks for an additional 1-2 minutes.
Serve warm with vegetables, rice or noodles.
Notes
I usually start with the steak first since the cook time is a bit longer, and steak benefits from a few minutes of resting after it's cooked!