Prepare the marinade by mixing soy sauce, sesame oil, sugar, and minced garlic in a bowl.
Add the sliced beef to the marinade and let it sit for at least 10 minutes.
While the beef marinates, cook the jasmine rice according to package instructions.
Heat a skillet over medium-high heat and add a little oil.
Add the marinated beef to the skillet and cook for 3-5 minutes until browned.
Remove the beef from the skillet and set aside.
In the same skillet, quickly stir-fry the carrots and bell peppers for 2-3 minutes.
Assemble the bowl by placing a serving of rice at the bottom.
Layer the cooked beef on top of the rice.
Add the sautéed vegetables and blanched spinach for color and nutrition.
Garnish with sesame seeds and chopped green onions.