Extra rice is the key phrase here. After training, load up this teriyaki beef bowl with as much rice as you need to refuel properly. High calorie recovery done right.
Prepare teriyaki sauce: In a saucepan, mix soy sauce, mirin, brown sugar, garlic, and ginger. Simmer over medium heat until sugar dissolves, about 5 minutes.
Combine cornstarch and water in a small bowl, then whisk into the simmering sauce. Continue to cook over low heat for 2 minutes until thickened. Remove from heat and set aside.
Heat vegetable oil in a large skillet over medium-high. Add onion and carrot, sauté for 3 minutes until onion is translucent and carrot begins to soften.
Add broccoli florets and cook for 2 more minutes, stirring frequently. Push vegetables to the side, increase heat to high, and add beef slices. Sear beef quickly—about 90 seconds per side until barely cooked through.
Pour the teriyaki sauce over beef and vegetables, reduce heat to low, and toss gently to coat everything. Simmer for 2 minutes to meld flavors, then remove from heat.
Divide extra rice among bowls (generously, as desired), layer the teriyaki beef and vegetables over rice, and drizzle with remaining sauce.