In a medium bowl, whisk together the lemon juice, olive oil, minced garlic, cumin, coriander, turmeric, salt, and pepper to create the marinade.
Slice the chicken breast into thin strips, toss them in the marinade, and let them sit for at least 10 minutes to absorb the flavors.
Heat a large non-stick skillet over medium-high heat and add the chicken strips, cooking for 5-7 minutes until golden brown and cooked through.
While the chicken cooks, dice the cucumber, halve the cherry tomatoes, and finely mince the red onion; toss them together in a small bowl.
In a separate small ramekin, whisk the tahini with one teaspoon of water until it reaches a smooth, pourable consistency.
Assemble the bowl by placing the warm cooked brown rice at the base, topping it with the spiced chicken and the fresh vegetable salad.
Finish the dish by drizzling the creamy tahini sauce over the top and serving immediately.