In a large mixing bowl, whisk together olive oil, 10ml lemon juice, minced garlic, cumin, coriander, paprika, turmeric, cinnamon, salt, and black pepper.
Add the sliced chicken thighs to the marinade, coating thoroughly, and allow to marinate for at least 20 minutes.
Heat a heavy-bottomed skillet over medium-high heat.
Sear the chicken in batches until deeply browned and the internal temperature reaches 74 degrees Celsius, approximately 8 to 10 minutes.
Prepare the tahini dressing by whisking together the tahini, 15ml lemon juice, and water until a smooth, pourable emulsion is formed.
Divide the cooked basmati rice among four serving bowls.
Top each bowl with equal portions of the cooked chicken, diced cucumber, halved cherry tomatoes, and sliced red onion.
Drizzle the prepared tahini sauce over each bowl and serve immediately.