If using bread roll, soak in water for 1-2 minutes then squeeze dry. In a bowl, combine 500 g minced meat, the bread or breadcrumbs, 1 chopped onion, 1 egg, salt, pepper, marjoram, and tarragon if using. Mix until well combined.
Shape the mixture into meatballs of roughly equal size.
Heat a pan over medium-high heat. Fry the meatballs for 8-10 minutes, turning occasionally, until cooked through. For pork meatballs, ensure internal temperature reaches 63°C (145°F); for chicken, 74°C (165°F).
Remove meatballs from pan. Add water or broth to deglaze the pan, scraping up any browned bits. Simmer for 2-3 minutes and season to taste.
Return meatballs to the pan to coat with sauce, or serve the sauce separately.