To begin, prepare the spicy sauce. Add the Greek yogurt, sriracha, rice vinegar, low sodium soy sauce, honey, grated ginger, and crushed red pepper flakes to a blender. Blend until completely smooth and creamy. Set aside.
Next, prep the beef. If you haven’t already, place the steak in the freezer for about 30 minutes—this makes slicing it thin much easier. Slice the semi-frozen steak into ¼-inch pieces and transfer to a large bowl.
In a separate bowl, whisk together the soy sauce, coconut sugar, sesame oil, chili garlic sauce, rice wine vinegar, garlic, ginger, and kosher salt.
Pour the marinade over the beef, add the thinly sliced shallot, and toss well to coat. Cover and let marinate for at least 30 minutes, or up to 3 hours for deeper flavor.
Once the beef has marinated, heat a large skillet over high heat. Add the avocado oil and allow the pan to get very hot. Working in small batches, add the beef in a single layer and sear quickly, cooking for 1–2 minutes per side until caramelized and just cooked through. Transfer the cooked beef to a plate and repeat until all of the meat is cooked.
While the beef cooks, prepare your rice and fry the eggs to your liking.
To assemble the bowls, start with a base of warm rice, then top with the bulgogi beef, a fried egg, cucumber ribbons, and kimchi.
Finish with a generous drizzle of the spicy sauce and a sprinkle of sesame seeds if desired. Serve immediately and enjoy.