Wash chicken leg thoroughly with cold water, dab dry with kitchen paper and season with salt and pepper. Place on a fat pan of the oven and roast in the preheated oven (electric: 175 °C/ gas: level 2) for about 40 minutes.
In the meantime, mix olive oil, ketchup and paprika. Peel garlic and cut into slices. Clean, wash and cut the bell peppers into pieces. Clean, wash and cut spring onions into rings. Put some spring onion green aside.
Wash the rosemary, dab dry and pluck the needles from the stalks. Heat the oil in a pan. Fry the garlic, spring onions and peppers in it, turning them over. Add rice and rosemary, deglaze with stock and let the rice swell for about 20 minutes on a low heat, covered.
Season with salt and pepper. Sprinkle leek green over paprika rice and arrange on a plate with the chicken leg. Garnish with rosemary and serve sprinkled with paprika.