01 - Rinse Japanese rice under cold water until water runs clear. Combine rice and water in a pot or rice cooker. Cook according to appliance instructions, or bring to boil, then cover and simmer on low heat for 15 minutes. Let rest for 10 minutes before fluffing and serving.
02 - Whisk together rice vinegar, sugar, and salt in a small bowl until dissolved. Add cucumber and carrot slices, toss thoroughly to coat, and set aside to marinate for at least 15 minutes.
03 - Pat fish fillets completely dry with paper towels. Brush with soy sauce and mirin mixture. Heat vegetable oil in a nonstick skillet over medium heat. Place fish skin-side down and cook for 3-4 minutes per side until flesh is opaque and flakes easily with a fork. Transfer to a plate and rest briefly.
04 - Whisk eggs with soy sauce until well combined. Pour into a small nonstick pan over medium-low heat. Cook as soft scrambled eggs, stirring gently until just set, or create a thin omelet and slice into strips. Remove from heat while still moist.
05 - Divide cooked rice between two bento boxes or plates. Sprinkle with toasted sesame seeds and nori strips. Arrange grilled fish, pickled vegetables, egg, avocado slices, edamame, and apple sections in separate sections. Serve immediately, or let cool completely, cover, and refrigerate for an on-the-go breakfast.