Preheat your oven to 375°F (190°C)
Marinate the chicken: In a large bowl, add the chicken. Then, mix together tomato paste, lemon juice, parsley, garlic, ginger, olive oil, and all the spices. Rub the marinade all over the chicken leg quarters. Let it marinade for at least 30 minutes (or marinate for up to 24 hours in the fridge for more flavor). Prep the veggies: In a large baking dish or sheet pan, toss the carrots, potatoes, and onion with a little olive oil, paprika, garlic powder, salt, and pepper.
Assemble the dish: Nestle the marinated chicken on top of the vegetables. Lay thin slices of lemon over and under each piece of chicken
Roast covered: Cover the baking dish with foil and roast in the oven for 40 minutes at 375°F. This helps the chicken stay juicy and tender.
Roast uncovered: Remove the foil, increase the oven temperature to 400°F, and roast for another 20 minutes, or until the chicken is golden and fully cooked through with a crispy skin.
Finish with lemon: Once out of the oven, drizzle the dish with a little fresh lemon juice and lemon zest for a bright, zesty finish. Let the chicken rest for 5 minutes before serving to keep it juicy.