Clean the chicken hearts, removing any veins and fat. If using turkey hearts, cut into small cubes. Season all with salt and pepper.
Cook the bacon strips over medium-high heat until the fat renders and they brown. Add the diced onions and chicken hearts, stirring frequently until the hearts brown on all sides.
Add the silver onions, bay leaves, thyme, and red wine. Bring to a boil over medium-high heat for 2-3 minutes, then reduce heat to low and simmer with the lid half-open for 45 minutes.
Add chicken broth gradually while stirring, adding enough to reach your desired consistency.
Bring the mixture to a boil over medium heat for 2-3 minutes.
Remove from heat and stir in the mustard and either the tomato ketchup or tomato paste. Taste and adjust seasoning with salt and pepper as needed.
Sprinkle with the parsley and serve with rice or short pasta.
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