Take the chicken thighs out of the fridge about 30 minutes before cooking to ensure even cooking. Season them with a mixture of salt, pepper, and cumin, rubbing well on both sides. Let rest at room temperature for those 30 minutes. Then, add saffron threads to the hot water and let it steep for 30 minutes.
Meanwhile, dice and chop the vegetables. Reserve. Heat a large nonstick pan over medium-high heat, add 2 tbsp of oil and sear the chicken thighs, skin side down (or top of the thighs side down), for 3-4 minutes without moving or until skin is golden. Flip chicken to the other side and cook for another 3-4 minutes.
Transfer thighs to a plate and reserve. Remove excess oil/grease (leave about 1 tbsp). Meanwhile, add and cook the onion and bell pepper over medium heat for about 3-4 minutes, or until onion is soft. Add garlic and cook for 1 minute. Then add the rice and sauté for about 1-2 minutes, stirring every now and then.
Add the wine and let almost evaporate about 2 minutes. Stir in the steeped saffron, the broth, the tomato paste, and the bay leaf. Transfer the chicken back to the pan, nestling them on top of the rice. Let come to a boil!
Then cover the pan with a lid and let cook over medium heat for 10-15 minutes or until chicken is cooked and rice is al dente. The rice will absorb the liquids. About 3 minutes before the end of this cooking time, add the diced tomatoes and the peas, cover, and let it cook. Right before serving, squeeze lemon over the thighs and add the chopped herb.
OPTIONAL: Before adding the lemon juice and herbs, you may brush the top of the chicken thighs with a hint of honey and broil for a couple of minutes if desired.