01 - Rinse the rice, quinoa, or farro under cold water. In a medium saucepan, combine grains, water or broth, and salt. Bring to a boil, reduce heat, cover, and simmer until tender (about 20 minutes for rice or quinoa, 30 minutes for farro). Fluff with a fork and set aside.
02 - In a bowl, mix soy sauce, olive oil, lemon juice, minced garlic, and black pepper. Add the beef slices, toss to coat, and let marinate for at least 15 minutes.
03 - Heat a large skillet or grill pan over medium-high heat. Add the marinated beef and cook for 2-3 minutes per side, until browned and just cooked through. Remove from heat and let rest.
04 - While the beef cooks, prepare all vegetables as directed: slice the bell pepper, halve the cherry tomatoes, dice the cucumber, julienne the carrots, and wash the greens.
05 - In a small bowl, whisk together olive oil, lemon juice, Dijon mustard, honey, salt, and pepper until emulsified.
06 - Divide the cooked grains among four bowls. Top each with spinach or greens, bell pepper, tomatoes, cucumber, carrots, and sliced beef.
07 - Drizzle with dressing and garnish with sesame seeds, herbs, and avocado slices if desired. Serve immediately.