If you don't have it on hand already, start by cooking the rice. Bibimbap is best with freshly cooked rice.
2 cups freshly cooked rice
First sauté the vegetables. Starting with the zucchini, add 1-2 tsp of cooking oil (olive or avocado is my preference) and cook over medium heat until zucchini's color has become bright green and slightly wilted in texture. Add salt (and pepper if you like) to taste. Remove and set aside.
1/2 cup julienned zucchini, 1/8 tsp salt (just a pinch)
Next we cook the spinach. In the same pan, add another 2 tsp cooking oil and add in the minced garlic. Once fragrant, add the spinach and stir to coat. The spinach will wilt a LOT. Once wilted, drizzle sesame oil and sprinkle the salt. Toss to coat. Remove and set aside.
1 bundle spinach, 1 tsp sesame oil, 1/4 tsp salt, 1 tsp sesame seeds, 1 tsp minced garlic
Beef topping is last. Mix the seasoning ingredients in a separate bowl. In the same pan that you've been using, add in 2 tsp of cooking oil, then add the beef into the pan. Stir to cook evenly. Once most of the pink/red is out of the beef, add the seasoning sauce. Cook the beef in the seasoning sauce until the sauce is evaporated. Remove and set aside.
1/4 lb shaved beef, 1 TBSP soy sauce, 1 tsp garlic powder, 1/4 tsp black pepper, 1 tsp sugar (optional), 1 TBSP sake