Melt the butter in a large, heavy pan on medium heat and cook the onions until they turn almost reddish brown. Remove onions from the pan, add the chicken pieces and sauté until golden on all sides.
Push the chicken to one side, add the bell peppers, jalapeño and tarragon and cook, stirring, for 1 minute. Stir in the tomatoes and reserved onions. Season with salt and pepper. Cover and simmer for 20 minutes.
While the chicken mixture is simmering, heat chicken stock until hot. Wash and drain the bulgur.
Remove the chicken pieces to a plate; stir in the bulgur, and toss it with the vegetables and sauce until it is well coated with the sauce, about 3 minutes. Add the hot chicken stock, let boil 1 minute, replace the chicken pieces — except the breasts — cover, and simmer over low heat for about 15 minutes, until all of the liquid is absorbed. Add the breast pieces to the pan, remove from heat, and keep covered in a warm spot for 10 minutes.
Nutrition information per serving:
Calories885Fat42 gSodium435 mg