Pat the drumsticks dry and season with the salt, pepper and half of the paprika.
Heat the olive oil in a 12-inch skillet over medium-high heat. Sear the drumsticks skin-side down for 6 to 8 minutes until deep golden, turn and brown for 2 minutes more. Transfer to a plate.
Leave about 2 tablespoons of fat in the pan. Cook the onion over medium heat for 4 minutes, then add the garlic, turmeric, cumin and remaining paprika for 30 seconds.
Add the rinsed rice and stir for 2 minutes to toast it.
Crush the saffron into the hot stock and pour it into the skillet. Nestle the chicken in skin-side up, keeping the skin above the liquid, and add the lemon slices.
Bring to a simmer, cover, reduce the heat to low and cook for 22 minutes without lifting the lid. The chicken should reach at least 74°C (165°F).
Scatter the peas over the rice, cover, remove from the heat and rest for 5 minutes.
Fluff the rice, squeeze over some lemon juice, sprinkle with parsley and serve.