In a medium bowl, whisk together the harissa paste, honey, olive oil, lemon juice, minced garlic, salt, and pepper.
Add the chicken pieces to the marinade and stir to coat thoroughly; let marinate for at least 10 minutes.
Heat a large non-stick skillet over medium-high heat and add the chicken and marinade.
Cook chicken for 8 to 10 minutes, stirring occasionally, until caramelized and the internal temperature reaches 165 degrees Fahrenheit.
In a separate small bowl, combine the Greek yogurt, crumbled feta, chopped mint, and lemon zest to create the sauce.
Divide the cooked grains into four bowls.
Top each bowl with equal portions of the cooked chicken, diced cucumber, and cherry tomatoes.
Drizzle the feta mint sauce over the bowls and garnish with pickled red onions.