We crumble the toast and pour cream over it. We finely chop the onion. In a pan over medium heat, we melt the butter and sauté the onion in it, stirring constantly, until it becomes translucent for 2 minutes. We mix ground meat, salt, pepper, allspice, egg, onion in melted butter where the onion was sautéed, and soaked bread crumbs. We mix a smooth batter, which we let rest in the refrigerator for 2 hours. From the meat mixture, we shape balls, which we gently flatten with our hands. We spread them on a GN pan, moisten with broth and bake. We serve with sauce: We pour cream and broth over the meatballs. We let it simmer and season with salt and pepper.