Preheat the oven to 475° F. Line a baking sheet with parchment paper or rub with oil.On the sheet pan, toss together the steak, shallots, pepper, and flour. Add 1 tablespoon oil, tossing to coat. Toss with the pickled ginger. Arrange the steak to one side of the baking sheet. Add the broccoli to the other side. Toss with oil, salt, and pepper. Bake 10 minutes. Meanwhile, make the sauce. In a bowl, whisk together the tamari, maple syrup, Gochujang, ginger juice, garlic, and sesame oil. Add the sesame seeds.Remove the broccoli from the sheet pan. Then pour 2/3 of the sauce over the steak, toss it up in the sauce. Switch the oven to broil. Broil 2-5 minutes, until the meat is crisping. Watch closely. In a bowl, toss together the cucumbers with the green onions, chili flakes, and salt. Ad 1-2 teaspoons toasted sesame oil. Serve the steak, broccoli, and cucumber salad with extra sauce and green onions over steamed rice. Drizzle with spicy mayo.