Mix the Sauce: In a small mixing bowl, combine soy sauce, honey, gochujang, grated ginger, garlic, and sesame oil. Whisk the ingredients until smooth, then set the bowl aside.
Cook the Vegetables: Heat 1 tablespoon of olive oil in a large skillet over high heat. Once the oil is shimmering, add the mushrooms and sauté them for about 3 minutes, or until they begin to soften. Stir in the spinach and cook until it wilts, which should take another 2 minutes. Remove the cooked vegetables and transfer them to a separate plate.
Prepare the Steak: Using the same skillet, heat the remaining tablespoon of olive oil over high heat. When the oil is hot, add the sliced steak. Cook, stirring occasionally, for 5–8 minutes until the meat is browned and caramelized at the edges. Pour in the sauce mixture you prepared earlier, bring it to a boil, and then lower the heat to medium. Allow the sauce to simmer and thicken for about 5 minutes. Add the green onions, stir, and cook for an additional minute until they are tender. Stir in the fresh basil, then remove the skillet from the heat.
Assemble the Bowls: Distribute the cooked rice evenly among six serving bowls. Layer the rice with the sautéed vegetables and the beef mixture. Garnish each bowl with toasted sesame seeds and carrot ribbons for a colorful and flavorful presentation.
Prepare the Yum Yum Sauce: In a small bowl, combine tahini, honey, smoked paprika, garlic powder, onion powder, chili powder, and kosher salt. Gradually whisk in water until the sauce reaches a smooth, pourable consistency. Adjust seasoning to taste. Serve this sauce drizzled over the bowls or on the side for dipping.
Serve and Store: Serve the bowls immediately while warm, paired with the Yum Yum sauce. Any leftovers can be stored in an airtight container in the refrigerator for up to 3 days.