Preheat the oven to 180°C.
Skin the sausage, then coarsely chop. Dice the roasted pepper into cubes. Finely chop the onion and red pepper. Mixed all these with the breadcrumbs and egg yolk. Season to taste.
Wipe dry the chicken with kitchen towel. Loosen the skin around the neck and breast, then fill with the stuffing and tighten with a small meat skewer. You can stuff the area between the thighs and the torso too (under the skin) if you like, but don't tie the legs together then!
Quarter the lemons and put these into the cavity.
Season the chicken with salt, rub it with some oil and roast for about 90 minutes, until golden and clear juices run from the thighs.
Remove from the oven and rest (covered) for 15 minutes.
Meanwhile, make some gravy from the pan juices, wine, flour and chicken stock. Cook it for about 10 minutes until you get a thick, smooth sauce, then strain it through a sieve if you like.
Carve the chicken and serve with the stuffing and the gravy.